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germplasm releases; harvest date; raspberries; insect pests; plant viruses; plant pests; fruit quality; crop yield; Rubus idaeus; Amphorophora; firmness; agronomic traits; fruit crops; high-yielding varieties; British Columbia
Abstract:
... Raspberry cv. Esquimalt, derived from the cross Comox × Glen Ample, is a vigorous cultivar with spineless canes and upright growth habit and large, firm fruits with excellent fresh flavour. The cultivar is suitable for hand-picking and can be used to extend fresh raspberry market season due to its delayed ripening. ...
... In Australia 83 genetically different endemic grapevine phylloxera strains have been characterised which vary in their geospatial distribution on both ungrafted and grafted Vitis Vinifera under field conditions. Damage levels on V. Vinifera also differed depending on which phylloxera strain was present. In order to understand the interactions which may influence phylloxera distribution and vine da ...
insect pests; Pseudococcus viburni; sex pheromones; chemical composition; monoterpenoids; field experimentation
Abstract:
... The sex pheromone of the obscure mealybug, Pseudococcus viburni, consists of (1R*,2R*,3S*)-(2,3,4,4-tetramethylcyclopentyl)methyl acetate, the first example of a new monoterpenoid structural motif in which the two isoprene units forming the carbon skeleton are joined by 2'-2 and 3'-4 connections rather than the usual 1'-4, head-to-tail connections. This highly irregular terpenoid structure, and th ...
... Analysis of pheromone gland extracts of females of the south coastal coneworm, Dioryctria ebeli, collected from infested cones of slash pine (Pinus elliottii) at the Withlacochee Seed Orchard near Inverness, Florida, USA, yielded (9Z,11E)-tetradecadienyl acetate (Z9,E11-A4:Ac). Initial field trials showed that (Z9,E11-A4:Ac) was not attractive to male D. ebeli. However, addition of (3Z,6Z,9Z,12Z,1 ...
Dioryctria abietivorella; insect pests; sex pheromones; chemical composition; field experimentation; insect traps; Abies
Abstract:
... The sex pheromone of the fir coneworm moth consists of a blend of (3Z,6Z,9Z,12Z,15Z)-pentacosapentaene and (9Z,11E)-tetradecadienyl acetate. Analogous blends of polyunsaturated, long-chain hydrocarbons with much shorter chain aldehydes or alcohols recently have been discovered in three other moth species in the superfamily Pyraloidea. These combinations of components from two distinct structural c ...
insect pests; sex pheromones; chemical composition; synthesis; field experimentation; insect traps
Abstract:
... Our objective was to identify the sex pheromone of Lymantria bantaizana (Lepidoptera: Lymantriidae) whose larvae feed exclusively on walnut, Juglans spp., in China, and Japan. Coupled gas chromatographic-electroantennographic detection (GC-EAD) analyses of pheromone gland extracts revealed a single EAD-active component. Retention index calculations of this compound on four GC columns suggested tha ...
Tortricidae; pest identification; females; pheromone glands; sex pheromones; chemical composition; acetates; pest monitoring; pheromone traps; insect pests; Macadamia integrifolia; orchards; macadamia nuts; Costa Rica
... Terpenoids are well known to mediate interactions among plants, herbivores and their natural enemies. In rice, (E)-β-caryophyllene has been reported to attract a major insect pest, Nilaparvata lugens, and its egg parasitoid, Anagrus nilaparvatae. Yet, it remains unclear whether (E)-β-caryophyllene also influences other herbivores in rice. Here we demonstrated that a rice (E)-β-caryophyllene syntha ...
insect pests; sex pheromones; chemical composition; stereoisomers; field experimentation; insect traps; pest monitoring; insect control
Abstract:
... We identified, synthesized, and field-tested the sex pheromone of female red cedar cone midge Mayetiola thujae (Hedlin) (Diptera: Cecidomyiidae), a pest insect in red cedar Thuja plicata seed orchards. Coupled gas chromatographic (GC)-electroantennographic detection analyses of pheromone extract revealed three components (A, B, C) that elicited responses from antennae of males, all of which occurr ...
Crambidae; sex pheromones; chemical composition; pheromone glands; electroantennography; pheromone blends; stereoisomers; sex attractants; insect pests; Mangifera indica; Papua New Guinea
Abstract:
... The sex pheromone of the red banded mango caterpillar, Deanolis sublimbalis (Lepidoptera: Crambidae), a serious pest of the mango Mangifera indica (Anacardiaceae) in India and Southeast Asia and a recent invader into northern Australia, has been identified. Three candidate compounds were identified from pheromone gland extracts of female moths, using gas chromatography (GC), GC-electroantennograph ...
... Green leaf volatiles (GLVs), the products of the hydroperoxide lyase (HPL) branch of the oxylipin pathway, play important roles in plant defense responses to both insect pests and pathogens. However, little is known about the role of GLVs in the defense responses of rice to the white-backed planthopper (WBPH, Sogatella furcifera (Horváth)). Here, we found that the rice HPL gene OsHPL3 was upregula ...
... In response to insect feeding, corn plants (Zea mays cv. Delprim) release elevated levels of volatile organic compounds (VOCs), including the C6-volatile (Z)-3-hexenol. The level of mRNA accumulation for a series of defense genes was monitored in response to application of (Z)-3-hexenol (50 nmol) to undamaged plants. The induction of transcripts for hpl (hydroperoxide lyase), fps (farnesyl pyropho ...
sex pheromones; chemical composition; field experimentation; wind tunnels; insect pests
Abstract:
... (Z, Z)-6,9-Heneicosadien-11-one (Z6Z9-11-one-21Hy) was identified as the major sex pheromone component of the painted apple moth (PAM), Teia anartoides (Lepidoptera: Lymantriidae), on the basis of (1) comparative gas chromatographic-electroantennographic detection (GC-EAD) analyses, GC-mass spectrometry (MS), high-performance liquid chromatography (HPLC)-MS, and HPLC-UV/visible spectroscopy of phe ...
Suresh Varsani; Sajjan Grover; Shaoqun Zhou; Kyle G. Koch; Pei-Cheng Huang; Michael V. Kolomiets; W. P. Williams; Tiffany Heng-Moss; Gautam Sarath; Dawn S. Luthe; Georg Jander; Joe Louis
... The corn leaf aphid (CLA; Rhopalosiphum maidis) is a phloem sap-sucking insect that attacks many cereal crops, including maize (Zea mays). We previously showed that the maize inbred line Mp708, which was developed by classical plant breeding, provides enhanced resistance to CLA. Here, using electrophysiological monitoring of aphid feeding behavior, we demonstrate that Mp708 provides phloem-mediate ...
... MAIN CONCLUSION: Linolenic acid produced by the ω-3 fatty acid desaturase MSD3 in sorghum is used for insect-induced jasmonic acid production and is important for resistance against Spodoptera frugiperda. Jasmonic acid (JA) is a phytohormone that regulates both plant development and stress responses. In sorghum (Sorghum bicolor), the ω-3 fatty acid desaturase Multiseeded3 (MSD3) and the 13-lipoxyg ...
... In the Great Basin Desert, Nicotiana obtusifolia (synonymous with Nicotiana trigonophylla) and Nicotiana attenuata co-occur, but the former is frequently less attacked by larvae of the tobacco hornworm than the latter, despite having lower nicotine and trypsin protease inhibitor defenses. Glycosides of the diterpene, 17-hydroxygeranyllinalool (HGL-DTGs) have recently been found to be important def ...
Adilson R. Sabino; Sheila S. Tavares; Alessandro Riffel; Jia V. Li; Demetrius José; Chrystian I. M.A. Feres; Lucas Henrique; Jaim S. Oliveira; Gonçalo D.S. Correia; Anderson R. Sabino; Ticiano G. Nascimento; Geofrey Hawkes; Antônio E.G. Santana; Elaine Holmes; Edson S. Bento
... Sugarcane (Saccharum officinarum) has been considered one of the most efficient energy crops, but its production yield is sensitive to outbreaks of pest insects, especially the sugarcane borer Diatraea saccharalis. Genetic breeding programs and biotechnology projects have been developed to decode the defense mechanisms of sugarcane against herbivorous insect attacks, and the develop plague-resista ...
... The allelochemic, 2-tridecanone, which conditions resistance in the wild tomato Lycopersicon hirsutum f. glabratum to Manduca sexta and plays an important role in the resistance to Leptinotarsa decemlineate is shown to induce an enhanced level of tolerance to the carbamate insecticide carbaryl in a third important insect pest of tomato, Heliothis zea. This phenomenon has important implications reg ...
cotton; organic production; Zea mays; heat treatment; harvesting equipment; fiber quality; insect pests; pest control; California; New Mexico; Texas
Abstract:
... Organic cotton production requires alternatives to havest aid chemicals for crop termination and fiber quality preservation. In these trials, a self-propelled two-row thermal defoliation apparatus was tested in spindle picked and stripper harvested cotton. HVI classing data for thermal, chemical, and untreated control plots were compared. Fiber property data from similar trials in 2002 were presen ...
Helianthus annuus; Homoeosoma electellum; insect pests; trapping; Cochylis hospes; pheromone traps; population density; pest monitoring; pest identification; Texas; Manitoba; Midwestern United States; Great Plains region
... BACKGROUND: Entomogenous fungi are important factors in biological control, but innate immunity of insects restricts the efficiency of fungus infection. 20‐hydroxyecdysone (20E) is involved in regulating the immune response of insects. Our previous studies have revealed that 20E enhances the expression of antibacterial peptides in the worldwide pest Locusta migratoria. However, the mechanism by wh ...
... BACKGROUND: PPO (prophenoloxidase) cascade plays an important role in resisting invasion of entomogenous fungus. The 20‐hydroxyecdysone (20E) exerts potent effect on the innate immunity in many insects. However, whether 20E controls the PPO cascade system against fungi and the regulatory mechanism in insects remains unclear. RESULTS: In this study, both the proteome and transcriptome of Locusta mi ...
... Pesticides are applied to protect crops from a variety of insect pests but their application cause toxicity to plants that results, among others, in reduction of protein as well as amino acid contents. The present study is aimed at observing the effect of seed pre-soaking with 24-epibrassinolide (EBL) on the protein and amino acid content in the leaves of Brassica juncea L. grown in soil that is a ...
Lygus lineolaris; morphospecies; hybrids; insect pests; ribosomal RNA; DNA; Lygus elisus; genes; nucleotide sequences; Lygus hesperus; genetic polymorphism; polyphyly
Abstract:
... A segment of the nuclear 28S rRNA gene was compared among six species of Lygus [Lygus hesperus (Knight), Lygus keltoni (Schwartz), Lygus borealis (Kelton), Lygus elisus (Van Duzee), Lygus lineolaris (Palisot de Beauvois), and Lygus vanduzeei (Knight)]. The DNA sequences were separate into three main groups. The LL group contains L. lineolaris and L. vanduzeei. Group LBLE is composed of L. elisus a ...
insect attractants; chemical composition; butanol; vapors; acetic acid; ammonia; putrescine; mixtures; baits; insect pests; Anastrepha; fruit flies; patents; USDA; United States
Abstract:
... Compositions and lures are described which provide 3-alkyl-1-butanol vapors and vapor blends of 3-alkyl-1-butanol with one or more compounds selected from the group consisting of acetic acid, ammonia, putrescine and mixtures which function as highly effective attractants for frugivorous pest flies especially of Anastrepha species. By attracting frugivorous pest insects, the chemical attractants pr ...
Michael J. Landsberg; Sandra A. Jones; Rosalba Rothnagel; Jason N. Busby; Sean D. G. Marshall; Robert M. Simpson; J. Shaun Lott; Ben Hankamer; Mark R. H. Hurst
... Toxin complex (Tc) proteins are a class of bacterial protein toxins that form large, multisubunit complexes. Comprising TcA, B, and C components, they are of great interest because many exhibit potent insecticidal activity. Here we report the structure of a novel Tc, Yen-Tc, isolated from the bacterium Yersinia entomophaga MH96, which differs from the majority of bacterially derived Tcs in that it ...
Guillermo Sánchez‐Martínez; Constance J. Mehmel; Ernesto González‐Gaona; Sylvia R. Mori; Juan Antonio López‐Hernández; José Carlos Monárrez‐González; José Leonardo García‐Rodríguez; Jorge Manuel Mejía‐Bojórquez; Nancy E. Gillette
... Dendroctonus pseudotsugae is the most important forest insect pest of Douglas‐fir Pseudotsuga menziesii in North America. Two subspecies of Douglas‐fir beetle are recognized: D. pseudotsugae pseudotsugae, which inhabits southwestern Canada and western United States, and Dendroctonus pseudotsugae barragani, which occurs in northern Mexico. This study aimed to determine the effectiveness of 3‐methyl ...
Cimex lectularius; abdomen; body fluids; insect pests; chemical analysis; animal glands; aldehydes; nymphs
Abstract:
... Analyses of the dorsal abdominal glands of fourth- and fifth-instar nymphs of the bed bud, Cimex lectularius L. (Hemiptera: Cimicidae), indicated the predominant constituents were (E)-2-hexenal and (E)-2-octenal, with lesser amounts of 4-oxo-(E)-2-hexenal and 4-oxo-(E)-2-octenal. The latter two compounds have not been reported previously as occurring in bed bugs. There were no differences in the c ...
... In a search for chemical lures to manage the cosmopolitan crop pest western flower thrips (WFT), Frankliniella occidentalis, a Y-tube olfactometer was used to screen 20 compounds, including 18 4-pyridyl compounds. Comparison of Y-tube results for New Zealand flower thrips (NZFT), Thrips obscuratus, with field trapping data for ethyl nicotinate and ethyl isonicotinate, suggested that the minimum at ...
Thrips obscuratus; Thrips tabaci; insect pests; plant pests; bait traps; baiting; baits; carbonyl compounds; chemical structure; odors; pyridines; benzene; field experimentation; New Zealand
Abstract:
... On the basis of structural and/or aroma analogies to known thrips (Thysanoptera: Thripidae) lures, 35 compounds (18 pyridine derivatives, 13 benzene derivatives, and 4 other compounds), consisting of both synthetic and naturally occurring compounds, were screened for their ability to bring about increased thrips capture in field experiments using water traps in Canterbury, New Zealand. Most of the ...
forest trees; conifers; plant pests; Scolytidae; insect pests; insect control; insect repellents; pesticide formulations; patents; USDA; United States
Abstract:
... 4-allylanisole, and seven analogs, anisole, allylbenzene, 4-isopropylanisole, p-anisaldehyde, ethylbenzene, cumene and 4-methoxyacetophenone are demonstrated to be effective repellents for scolytid infestation. Conifers, a particular target for the scolytids, are protected by application of the compounds, either directly or suspended in a carrier. ...
... The epidermis of wheat (Triticum aestivum L.) leaves contains trichomes that contribute to resistance to insect pests and drought tolerance. In the present study, we examined the effects of 6-benzylaminopurine (BA) and methyl jasmonate (MeJA) treatment on trichome development on the leaves of wheat cv. Norin 61 seedlings. Without phytohormone treatment, trichomes on the adaxial leaf surface were s ...
... The compound 7,10,12-trihydroxy-8(E)-octadecenoic acid (TOD) has been produced by bioconversion of ricinoleic acid by Pseudomonas aeruginosa PR3. TOD and derivatives thereof are useful for controlling biological organisms, such as fungi and insects. ...
... New esterase substrates were synthesized using cis-, trans- and cis-trans-permethrinic acid chloride and then used to measure pyrethroid-cleaving enzymes in insects. The new substrates, namely cis-, trans- and cis-trans-7-coumaryl permethrates (7-CP), show a structure very similar to permethrin insecticide and yield fluorescent products on hydrolysis. These substrates were hydrolyzed by a commerci ...
Pseudotsuga menziesii; forest trees; coastal forests; Choristoneura occidentalis; insect pests; forest pests; plant pests; oceans; water temperature; spatial distribution; population density; air temperature; winter; larvae; eclosion; budbreak; climate change; phenology; British Columbia
Abstract:
... Three outbreaks of western spruce budworm were recorded on southern Vancouver Island between 1909 and 1930. After 1930, outbreaks were restricted to interior regions of British Columbia. We show that warming winter temperatures on southern Vancouver Island, related to warming sea temperature, promoted earlier larval emergence while the timing of bud flush has remained constant. This differential r ...
... Blowflies are known vectors of many foodborne pathogens and unintentional human ingestion of maggots by meat consumption may lead to intestinal myiasis. In fact, the control of insect pests is an important aspect of industrial and home-made food processing and blowflies (Diptera: Calliphoridae), which are among the most important pests involved in the damage of meat products. Most spices, largely ...
... The planthopper Laodelphax striatellus (Fallén) (Hemiptera: Delphacidae) is a serious insect pest of rice, Oryza sativa L., and has developed resistance to fipronil in Japan. Sequence analysis of L. striatellus RDL γ-aminobutyric acid (GABA) receptor subunit (LS-RDL) genes from a fipronilresistant population and a fipronil-susceptible strain identified the A2′N mutation (index number for M2 membra ...
... Fipronil is a relatively new insecticide with great potential for insect control, however widespread use of cyclodiene insecticides has selected for an A302S mutation in the Rdl (GABA gated chloride channel) allele. This mutation gives resistance to cyclodienes and limited cross-resistance to fipronil. Given the concern over the possible reduction in efficacy and/or lifetime that fipronil might be ...
... ATP-binding cassette (ABC) transporters constitute a large superfamily of proteins that mediate transport of a diverse number of substrates including nutrients, lipids and xenobiotics across membranes serving a variety of developmental and physiological functions. Here, we report on the molecular properties and biological roles of the ABC transporter LmABCH-9C in the migratory locust Locusta migra ...
... Studying the feeding, host damage, and transmission (i.e., acquisition, retention, and inoculation) of pathogens (plant and animal) by piercing-sucking arthropods is challenging. The piercing mouthparts are probed into opaque host tissues, precluding direct observation. This challenge was overcome by the invention of electropenetrography, or electrical penetration graph (both abbreviated EPG), the ...
Diuraphis noxia; Triticum; amplified fragment length polymorphism; biotypes; cluster analysis; genetic variation; hexaploidy; insect pests; introgression; landraces; wheat; United States
Abstract:
... Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), is an important insect pest which causes severe economic losses in wheat (Triticum spp.). Among the various U.S. RWA biotypes, biotype 1 (RWA1) and biotype 2 (RWA2) are the most prevalent and most virulent on cultivated genotypes. Although many sources of resistance to these biotypes are available among landraces, their relatedness should be ...
... Tomato is a major vegetable in sub-Saharan Africa and is grown mainly as a cash crop. The crop can grow throughout the year; however, production is constrained by diseases and insect pests, and by abiotic factors including low moisture stress, heat, and low soil fertility. Although susceptible to many diseases, old cultivars like ‘Marglobe’, ‘Rio Grande’, ‘RomaVF’ and ‘Moneymaker’ are still widely ...
... 1 Xylosandrus germanus typically colonizes physiologically-stressed deciduous hosts but it is increasingly being recognized as a key pest of ornamental nursery stock. We tested the attractiveness of common plant stress-related volatiles to ambrosia beetles occupying the nursery agroecosystem, as well as their ability to induce attacks on selected trees. Experiments were conducted in Ohio, U.S.A. 2 ...
... Canola is grown mainly as an oil-seed crop, but recently the interest in canola has increased due to its potential as a biodiesel crop. The main objectives of this paper were to evaluate effects of abiotic factors and seed treatment on canola plant establishment and pest pressure in the Southern High Plains of Texas. Data was collected at two field locations during the first seven months of two fi ...
... The Bacillus thuringiensis (Bt) Cry proteins are widely used in insect pest control. Despite their economic benefits, remaining concerns over potential ecological and health risks warrant their ongoing surveillance. Affinity reagents, most often antibodies, protein scaffolds, and aptamers, are the traditional tools used for protein binding and detection. We report a synthetic antibody (SA) alterna ...
Armillaria; plantations; drought; trees; risk; Nuculaspis californica; A horizons; iron; water stress; C horizons; Pinus resinosa; pathogens; insect pests; decline; nutrient deficiencies; rooting; tree mortality; mortality; pH; root rot; B horizons; fungi; Ontario
Abstract:
... This study was conducted to assess causes of unprecedented rates of mortality in maturing, commercial-sized red pine(Pinus resinosa Ait.) plantations in southern Ontario, Canada. Concentrated and diffuse mortality as well as windthrowof living trees were observed in many plantations, while others seemed disease-free. Nine sites exhibiting recent mortality(diseased) plus three not exhibiting diseas ...
temporal variation; sandy soils; insect pests; soil temperature; soil nematodes; soil water content; biological control agents; loamy sand soils; tropics; plant pests; fruit flies; Steinernema carpocapsae; lethal concentration 50; sandy clay soils; soil texture; larvae; Anastrepha obliqua; biological control
Abstract:
... The effects of soil depth, soil type and temperature on the activity of the nematode Steinernema carpocapsae (Filipjev) were examined using larvae of the West Indian fruit fly, Anastrepha obliqua (Macquart). Bioassays involved applying infective juveniles (IJs) to the surface of sterilized sand in PVC tubes previously inoculated with fly larvae of two ages. The 50% lethal concentration (LC50) valu ...
... There has been an ardent interest in herbivore saliva due to its roles in inducing plant defenses and its impact on herbivore fitness. Two techniques are described that inhibit the secretion of labial saliva from the caterpillar, Helicoverpa zea, during feeding. The methods rely on cauterizing the caterpillar's spinneret, the principal secretory structure of the labial glands, or surgically removi ...
insect pests; food plants; Pinus monticola; Pinus contorta var. latifolia; Leptoglossus; seed orchards; seed productivity; seed cones; seed set; mortality; British Columbia
Abstract:
... Leptoglossus occidentalis Heidemann is a serious pest of second-year cones in conifer seed orchards. We investigated the impact of this insect on first-year pine conelets. L. occidentalis adults and nymphs were caged on conelets of lodgepole pine, Pinus contorta var. latifolia Engelmann, and western white pine, Pinus monticola Dougl. ex D. Don. Abortion in lodgepole pine conelets was negligible, b ...
... Since the beginning of agriculture approximately 10,000 years ago, farmers have struggled to protect their crops from insect pests. This is particularly true for maize, an important agricultural foodstuff that is vulnerable to attack by wide variety of herbivores. Plant breeding is one strategy successfully employed to develop genotypes with improved resistance to these pests. One example is the m ...
Euproctis; insect pests; sex pheromones; synthesis; enantiomers; electrophysiology
Abstract:
... (R)- and (S)-10,14-dimethyl-1-pentadecyl isobutyrates were synthesized from (S)- and (R)-citronellols, respectively. The R enantiomer was as active as the natural pheromone but the S enantiomer was less active in the electrophysiological analyses, which provided conclusive proof that the absolute configuration of the natural pheromone is R. ...
geographical distribution; mixed forests; subterranean termites; insect surveys; plant pests; coniferous forests; species diversity; population density; Reticulitermes virginicus; forest damage; tree damage; Reticulitermes flavipes; Mississippi
Abstract:
... Termites were surveyed in pine and mixed forests in 4 southern Mississippi counties during 1999-2000. Branches, logs, and stumps in eleven plots were examined for termite activities. Pine stakes were installed in soil plots at 5 m intervals. They were examined for signs of termite infestation and foraging termites at 4.5, 10.5, and 16 months after installation. Three subterranean termite species i ...
Araneidae; Citrus; Clubionidae; Gnaphosidae; Lycosidae; agroecosystems; biological control; citrus fruits; gardens; guavas; habitats; insect pests; pest control; pitfall traps; population dynamics; species diversity; Pakistan
Abstract:
... Spiders for the present study were collected from different fruit gardens (i.e. citrus) located at various localities (i.e., Tehsil Samundri, Jaranwala, Tandlianwala and Faisalabad) of District Faisalabad, Pakistan. Spiders belonging to six families and 33 species were captured from the two fruit gardens during the one year of this study. The citrus fruits garden was found to be best populated hab ...
... Thrips (Thysanoptera: Thripidae) are the major insect pest of seedling cotton, Gossypium hirsutum L., on the Texas South Plains. The western flower thrips, Frankliniella occidentalis Pergande (Thysanoptera: Thripidae), has historically been the most abundant thrips species in cotton in the region. A field survey during the 2017 and 2018 growing seasons collected thrips from small-plot insecticide ...
... Thrips palmi Karny (Thysanoptera: Thripidae), invaded Miami Dade-county in 1990 and caused significant economic damage by defoliating various vegetable crops. It commonly occurs on the abaxial surface of host leaves where eggs are deposited individually inside the leaf tissues. Highest abundance of T. palmi was recorded on bean and eggplant in 1991–1994 in Tropical Research and Education Center re ...
insect pests; plant pests; Citrus sinensis; seasonal variation; Diaphorina citri; sticky traps; population dynamics; Citrus paradisi; Texas; Florida; Puerto Rico
Abstract:
... Population dynamics of Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae), were studied using yellow sticky traps in citrus groves in Florida, Texas, and Puerto Rico. Four groves were studied in Florida (three sweet orange groves and one grove of mixed Citrus spp.) and Texas (four grapefruit groves), and three groves were studied in Puerto Rico (one grove of mandarin oranges an ...
... Coffee berry borer (Hypothenemus hampei Ferrari), the most damaging insect pest of coffee worldwide, was first detected on Hawaii Island in 2010. Poorly managed, abandoned and feral coffee sites on the island have since been thought to harbour coffee berry borer (CBB) populations, which then negatively impact neighbouring coffee farms. In the present study, we sought to quantify CBB abundance in t ...
... Collembolans collected from hyphal mat soil and fruit bodies of Tricholoma matsutake were examined to investigate whether mycophagous microarthropods are a potential insect pest of this fungus in forest soils. The number of collembolans collected in hyphal mat soil did not differ significantly from that in adjacent nonmat soil. Fungal materials contained in the gut of collembolans consisted mostly ...
nitrogen balance; field crops; nodulation; Pisum sativum; population dynamics; intraspecific competition; peas; plant pests; yield components; population density; imagos; seed set; organic production; insect pests; plant nutrition; Sitona lineatus; root nodules; larvae; mortality; pods; plant available water; instars
Abstract:
... In a four-year study, we investigated the relationship between the damage to root nodules of organically produced pea (Pisum sativum L.) by the larvae of the pea leaf weevil (Sitona lineatus L.) and the abundance of adult weevils. In addition to studying natural infestations, we established artificial infestations within cages to assess the impact of different weevil densities on yield parameters ...
... The southern green stink bug, Nezara viridula is one of the most serious pests of tomatoes in Florida. During 2014 and 2015 tomato cropping seasons, three cultivars of sweet alyssum, Lobularia maritima (Brassicales: Brassicaceae) were evaluated in north Florida to determine their effectiveness in conserving the natural enemies of the southern green stink bug in open field conditions. The experimen ...
Aedes albopictus; insect pests; oviposition; ova; Aedes aegypti; sex ratio; insect vectors; imagos; Brazil
Abstract:
... The abundance and aggregation of eggs of Aedes aegypti L. and Aedes albopictus Skuse was evaluated in the municipalities of Cambé, Ibiporã, Jacarezinho, Maringá and Paranavaí, in the State of Paraná, Brazil by means of oviposition traps. Of the 225 installed traps, 100 were registered as positive for eggs; 4140 eggs were collected, thus demonstrating an highly aggregate distribution. Both spe ...
... Chemical control has been preferentially used to suppress pests by farmers mainly due to low price of the products and immediate action on target organisms. However, wide action range of the compounds, undesirable effects on non target organisms and the contamination of the environment are among the disadvantages of this method of control. This study evaluated the action of the insecticides chlorp ...
... Laboratory bioassays were conducted to evaluate the toxicity of the microbial pesticide spinosad to different life stages of the two-spotted spider mite, Tetranychus urticae Koch, as well as its sublethal effects on reproduction and population growth of this important mite pest. The biopesticide was applied to bean primary leaves or leaf discs carrying spider mites using a Potter spray tower (2.7 ...
azadirachtin; insect pests; Hyalomma dromedarii; camels; insecticidal properties; Digitalis purpurea; plant extracts; Calotropis procera; neem oil; digitoxin; chemical constituents of plants; insect control; Saudi Arabia
Abstract:
... The cardiac glycoside, digitoxin, from Digitalis purpurea L (Scrophulariaceae), a cardiac glycosidal (cardenolide) extract from Calotropis procera (Ait) R Br (Asclepiadaceae), azadirachtin and neem oil from Azadirachta indica A Juss (Meliaceae) were tested for their effects against larvae and adult stages of the camel tick, Hyalomma dromedarii Koch (Acari: Ixodidae). The contact LC50 values of the ...
Acca sellowiana; Conotrachelus; Drosophila suzukii; alternative hosts; fruits; insect pests; Brazil
Abstract:
... We report, for the first time, the occurrence and development of Drosophila suzukii Matsumura (Diptera: Drosophilidae) in fruits of Acca sellowiana (Berg) Burret (Myrtaceae). Although fruits of A. sellowiana present hard and thick skin, damage caused by another insect pest, Conotrachelus psidii Marshall (Coleoptera: Curculionidae), may have enabled fruit infestation by D. suzukii. ...
Bactrocera dorsalis; Cryptophlebia; insect pests; fruit crops; rambutans; disinfestation; quarantine; risk assessment; equations; host plants; plant pests; Hawaii
Abstract:
... The probit 9 standard for quarantine treatment efficacy (99.9968% mortality) was originally recommended for tropical fruits heavily infested with fruit flies and it centers on high mortality to achieve quarantine security. This standard may be too stringent for quarantine pests in commodities that are rarely infested or are poor hosts. The alternative treatment efficacy approach measures risk as t ...
... Many bacteria live only within animal cells and infect hosts through cytoplasmic inheritance. These endosymbiotic lineages show distinctive population structure, with small population size and effectively no recombination. As a result, endosymbionts are expected to accumulate mildly deleterious mutations. If these constitute a substantial proportion of new mutations, endosymbionts will show (i) fa ...
... The successful invasion of exotic plants is often attributed to the absence of coevolved enemies in the introduced range (i.e., the enemy release hypothesis). Nevertheless, several components of this hypothesis, including the role of generalist herbivores, remain relatively unexplored. We used repeated censuses of exclosures and paired controls to investigate the role of a generalist herbivore, wh ...
... Xanthopimpla stemmator (Thunberg), a solitary endoparasitoid of lepidopteran stemborer pupae, was recently imported into East Africa as a candidate biological control agent of gramineous stemborers. Suitability of Busseola fusca Fuller, Chilo partellus (Swinhoe), Eldana saccharina (Walker) and Sesamia calamistis Hampson, for the development of X. stemmator was studied in the laboratory. One- to 6- ...
... To predict whether an herbivorous pest insect will establish in a new area, the potential host plants must be known. For invading bark beetles, adults must recognize and accept trees suitable for larval development. The preference-performance hypothesis predicts that adults will select host species that maximize the fitness of their offspring. We tested five species of North American conifers and ...
Zuzana Tulpová; Helena Toegelová; Nora L. V. Lapitan; Frank B. Peairs; Jiří Macas; Petr Novák; Adam J. Lukaszewski; David Kopecký; Mira Mazáčová; Jan Vrána; Kateřina Holušová; Philippe Leroy; Jaroslav Doležel; Hana Šimková
... Russian wheat aphid (RWA) (Diuraphis noxia Kurdjumov) is a serious invasive pest of small‐grain cereals and many grass species. An efficient strategy to defy aphid attacks is to identify sources of natural resistance and transfer resistance genes into susceptible crop cultivars. Revealing the genes helps understand plant defense mechanisms and engineer plants with durable resistance to the pest. T ...
Plutella xylostella; insect pests; sampling; spatial distribution; Brassica oleracea var. italica; broccoli; variance; regression analysis; Australia
Abstract:
... Green's sequential sampling plan is widely used in applied entomology. Green's equation can be used to construct sampling stop charts, and a crop can then be surveyed using a simple random sampling (SRS) approach. In practice, however, crops are rarely surveyed according to SRS. Rather, some type of hierarchical design is usually used, such as cluster sampling, where sampling units form distinct g ...
... BACKGROUND: Surveillance strategies are often standardized and completed on grid patterns to detect pest incursions quickly; however, it may be possible to improve surveillance through more targeted observation that accounts for landscape heterogeneity, dispersal and the habitat requirements of the invading organism. We simulated pest spread at a local scale, using grape phylloxera (Daktulosphaira ...
... We considered the analysis of bioassay data resulting from the treatment of fruit that has been naturally infested, when the treatment sample size is unknown. Natural infestation may cause considerable variability between fruit. We described a procedure to quantify this variability and account for it in the bioassay analysis. We also discussed the optimal numbers of control and treatment fruit. ...
Eucalyptus; herbivores; insect pests; ornamental trees; people; trade; Australia; California
Abstract:
... Eucalyptus spp., native to Australia, have been introduced into many parts of the world as important timber and ornamental trees. Although the trees have important silvicultural qualities, they also have generated intense dissatisfaction, particularly among groups of individuals in California. The trees have benefited from the lack of insect pests and diseases in their adventive ranges but that ha ...
... In field, plants are exposed to multiple biological stresses simultaneously; for example, insect damage and pathogenic virus infection. In this study, we constructed a simple tripartite experimental system using tomato plant, their insect pest Bemisia tabaci (whitefly), and infectious tomato mosaic virus (ToMV). In the choice test, whiteflies laid more eggs on uninfected plant than on ToMV-infecte ...
... A 110-fold acetamiprid-resistant Plutella xylostella (L) strain was established after four selection experiments (in five generations) on a 9.5-fold resistant colony in the laboratory. The resistant strain did not show cross-resistance to chlorfluazuron or Bacillus thuringiensis subsp kurstaki Berliner, but displayed low resistance to cartap and phenthoate. ...
insect pests; biological control; semiochemicals; chemical composition; Dufour's gland
Abstract:
... Chemistry of Dufour glands associated with the venom complex in Bracon cephi (Gahan) and Bracon lissogaster Muesebeck (Hymenoptera; Braconidae), two parasitoids of the wheat stem sawfly, Cephus cinctus Norton (Hymenoptera: Cephidae), was examined by solid phase micro-extraction (SPME) and gas chromatography/mass spectrometry. Homologous series of five chemical classes were detected in individual g ...
... Acetylcholinesterase (AChE) cDNA from individual field-collected diazinon-resistant horn flies was amplified by RT-PCR. Sequencing of the amplification products revealed that 8/12 of the diazinon-resistant horn flies contained a point mutation previously associated with resistance to organophosphates in house flies and Drosophila, strongly suggesting that this cDNA encodes the AChE that is the tar ...
Tetranychus urticae; strains; plant pests; insect pests; monocrotophos; insecticide resistance; acetylcholinesterase; point mutation; enzyme activity; prediction; gene frequency
Abstract:
... Molecular mechanisms of monocrotophos resistance in the two-spotted spider mite (TSSM), Tetranychus urticae Koch, were investigated. A monocrotophos-resistant strain (AD) showed ca. 3568- and 47.6-fold resistance compared to a susceptible strain (UD) and a moderately resistant strain (PyriF), respectively. No significant differences in detoxification enzyme activities, except for the cytochrome P4 ...