An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
... Previous analyses have established that host species range in the most important determinant of plant— and animal—associated parasite species richness, and that the age of a host species within a region is, at most, much less important in determining this richness. However, these previous analyses were not able to completely rule out age as a cause, because the available host age estimations were ...
... The influence of four temperatures (15, 20, 25, and 29 C) on the growth of alfalfa (Medicago sativa L) seedlings, initially infested with 10 alfalfa bud mites (Eriophyes medicaginis Keifer) per seedling, was studied. Mite infestation caused significant reductions in dry weight of leaves and stems, petiole length, and leaf area of the seedlings at all temperatures. Dry weight reductions of infested ...
... A significant linear relationship (r = 0.86 to 0.90) was found between reduction in larval weight of tobacco budworm, Heliothis virescens (F•), and flowerbud gossypol content of 1) F₂ progenies of Upland stocks crossed with three Texas race stocks (Texas 216, Texas 490, and Texas 1134) of cotton, Gossypium hirsutum L., and 2) 221 entries from the race stock collection. Most of the suppression of g ...
... A survey of six Ellis county Kansas wheat (Triticum aestiuum L. em. Thell.) fields in 1979 indicated that 53% of culms were infested with larvae of the second generation wheat strawworm, Harmolita grandis (Riley) form grandis. Early maturing cultivars tended to escape infestation in cultivar yield trials at Hays, Kans. in 1979. However, ‘Centurk’, ‘Centurk 78’, ‘Rocky’, and ‘Parker’ cultivars had ...
... Several secondary plant metabolites are alleged to confer resistance of cotton, Gossypium hirsutum L., to various insects and mites. At the present time, only the inheritance of the sesquiterpenoid gossypol has been elucidated. This research was conducted to determine inheritance of several inferred/hypothesised allelochemics from cotton, in particular those alleged to confer resistance to the tob ...
... Insect resistance and glandless traits were introgressed, usually by the backcross method, into agronomically acceptable genetic backgrounds of cotton, Gossypium hirsutum L. The yield potential and adaptability of nine nectariless-nectaried pairs of cottons were evaluated for 1 to 3 years, 1978 to 1980, at six locations with and without early season insect control. Five of these pairs were in conv ...
... Development of southwestern corn borer [Diatrea grandiosella (Dyar)] larvae on corn (Zea mays L.) has been shown to be affected by the corn genotype on which they develop in the field. This investigation was undertaken to determine whether larvae could survive and grow on corn callus in the laboratory and, if so, whether the genotype of the callus would affect growth. Callus of several corn genoty ...
... Pericarp resistance to mechanical puncture using a penetrometer was determined for achenes of 72 sunflower (Helianthus annuus L.) genotypes grown in a greenhouse and sampled at 1, 5, 10, 15, and 20 days after fertilization. This study was undertaken to determine resistance of developing sunflower achenes to mechanical puncture and to relate this to possible genetic resistance to the sunflower moth ...
... In laboratory studies under reversed light-dark photoperiods, highest percentages of Heliothis virescens (F.) moths emerged during the first 6 h after initiation of the dark period. The primary simplex area of newly emerged male moths contained a dense, gel-like, creamy-white secretory fluid that became orange white in 5 to 10 h and progressively deepened in color to a dark-red-maroon color by 24 ...
... The insecticide chlorpyrifos-methyl was toxic to certain mite species when applied at 3.8 to 7.7 ppm on hulled oats (Avena sativa L.) or 3.1 to 5.0 ppm on hulless oats in a farm granary in southern Manitoba. Insecticide residues decreased by about 65% in hulled oats and 50% in hulless oats in 1 year and by 80% in hulled oats and 60% in hulless oats in 2 years. Bioassay of treated oats with Triboli ...
... Alfalfa (Medicago sativa L.) is often grown for seed in fields adjacent to fields of alfalfa grown for hay in southern Alberta. Swathing of the hay fields could cause pest and predatory insects to disperse into the adjoining seed fields, resulting in damage to the latter. To determine the potential of such movement occurring, populations of pest and predatory insects were compared before and after ...
... The effect of planting date and tillage system on the abundance of several insects in 'Florunner' peanuts (Arachis hypogaea L.) was examined in a 2-yr replicated field experiment. Two planting dates (late May and mid-June) and three tillage systems (conventional, reduced, and burned stubble) were evaluated. The abundance of the lesser cornstalk borer, Elasmopalpus lignosellus (Zeller), elaterids, ...
... We used computer simulation modeling to clarify the relationship between generation time and the rate of evolution of pesticide resistance. We examined the influence of generation time under various assumptions about genetics, population dynamics, and selection pressures. The simplest model demonstrated that the time required for resistance to evolve can be independent of generation time. However, ...
... To date, integrated pest management (IPM) of arthropods in commercial apple orchards has been comprised almost exclusively of a suite of what we term ‘first-stage' IPM practices focused upon pest monitoring. These practices predict first appearance, rate of development, and abundance of pest and beneficial arthropods, which leads to recommendation of selective properly-timed pesticides as the sole ...
... Three curculionid species Apion pisi F., Hypera variabilis Herbst and Sitona lineatus L. and an eriophyid mite, Eriophyes medicaginis K. were studied in a three years lucerce plantation for the period April 1986 to March 1987. A. pisi and H. variabilis were found to be absent from the field for a quite long period, lasting from July to October for the former and from end of June to mid November fo ...
... Field-plot studies were conducted in South Carolina from 1987 to 1990 to determine if several native materials i.e., Bermuda grass (Cynodon dactylon) hay, wheat straw, pine needles, wood litter, corn [maize] stalks and husks, and broomsedge (Andropogon virginicus) grass clumps were suitable as overwintering sites for arthropods. Significant differences were found between numbers of some insects in ...
... Twelve species of parasitic arthropods (one sucking louse, two fleas, one tick, and eight mites) were recovered from 51 meadow voles, Microtus pennsylvanicus (Ord); whereas nine species (one sucking louse, one bot, three fleas, one tick, and three mites) were collected from 48 white-footed mice, Peromyscus leucopus (Rafinesque), live-trapped on the grounds of Fort Detrick, Frederick County, Md., d ...
... Levels of both pest and nonpest arthropods were compared among four pairs of fields of conventional and organic rice, Oryza sativa L., in California. For seven major pests, there were no significant differences in abundance or in level of damage between conventional and organic treatments. However, in two organic fields, the combination of high infestation level (> 5% of rice plants infested) by i ...
... We compared the use of beat sheets, pitfall traps, and sweep nets for sampling common arthropods in peanut fields by taking weekly samples in the 1987 to 1989 growing seasons. We used sigma(2)/mean ratios and number of samples needed as the criteria for comparing sampling techniques. Pitfall trap samples had the largest means for soil surface-dwelling arthropods such as Labidura riparia (Pallas) ( ...
... Agents for biological control of arthropod pests have generally come from the trophic level above the pest (predators, parasites, diseases) rather than from the same trophic level (competitors). The rationale behind this approach is twofold. First, interspecific competition among herbivorous arthropods is thought to be weak; populations are kept at low levels through the action of natural enemies. ...
Malus domestica; crop losses; arthropod pests; cost benefit analysis; insecticide resistance; organophosphorus pesticides; quantitative analysis; simulation models; Delaware; Maryland; New Jersey; West Virginia
Abstract:
... Theoretical investigations have suggested that resistance may have severe effects on the long-run economic performance of agricultural production systems. In addition, regulatory withdrawals of critical insecticides may hasten the development of resistance. Given the complexity of the problem, an optimizable bioeconomic simulation was used to examine the economic effects associated with regulation ...
... Leaf-surface extracts of Nicotiana gossei Domin, N. benthamiana Domin, and N. bigelovii (Torrey) Watson were the most active of those from 17 species of Nicotiana evaluated against late second/early third instars of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood). Four chromatographically purified sucrose esters of N. gossei resulted in 88-94% mortality of late second/early third ins ...
life cycle (organisms); Oligonychus gossypii; relative humidity; biological development; longevity; fecundity; mortality; population dynamics; arthropod pests
Abstract:
... Life-history parameters of Mononychellus progresivus Doreste and Oligonychus gossypii (Zacher), 2 major mite pests of cassava in Africa, were determined in the laboratory at 3 constant relative humidities (30, 60, and 90% RH) obtained with saturated salt solutions. Experiments were carried out in airtight boxes placed in an air-conditioned room at 26 +/- 1 degrees C and a photoperiod of 12:12 (L:D ...
arthropod pests; phenology; models; Phyllonorycter blancardella; Malus domestica; population density; population; New York
Abstract:
... Sampling protocols for pest management programs often rely on phenology models to predict the time of occurrence of the stage to be sampled. In some cases it may not be possible or practical to predict occurrence with sufficient accuracy to ensure the reliability of a sampling protocol based on a single sampling session. We describe a sequential classification procedure that is useful for such sit ...
... Modification of tillage and herbicide use patterns to reduce adverse environmental effects on soybean [Glycine max (L.) Merr.] production may impact arthropod populations and damage in soybean. The objectives of this field study were to examine the effect of reduced tillage and herbicide use on populations of foliage-inhabiting phytophagous and beneficial arthropods and their damage in soybean. Ti ...
Brevipalpus phoenicis; Camellia sinensis; crop damage; arthropod pests; population density; estimation; leaves; photography; sampling; discoloration; plantations; Indonesia
Abstract:
... A sampling program for red and black flat mite, Brevipalpus phoenicis (Geijskes), damage and population density was developed and tested at an Indonesian tea, Camellia sinensis, plantation. A photographic standard was developed with five damage classes increasing in damage intensity, indicated by leaf area discolored by B. phoenicis feeding. Leaf damage was evaluated by comparison with the photogr ...
... We conducted literature-based comparative analyses of pesticide resistance evolution to evaluate 2 aspects of microevolutionary response to strong novel selection pressures. First, it has been proposed that herbivorous arthropods are preadapted to evolve resistance by a system of detoxifying enzymes the evolution of which was elaborated in response to plant defensive chemicals. To test this hypoth ...
... Since plants can be transformed genetically to produce functional antibodies, an immunological approach may be developed for controlling their arthropod pests. Specific antibodies would protect plants from arthropods if they could gain access to the pest antigen in sufficient amounts such that the normal function of the antigen is disrupted. In order to study the fate of ingested antibodies in the ...
agricultural machinery and equipment; patents; ova; USDA; design; plant pests; beneficial insects; insect control; arthropod pests; knapsack sprayers; biological control; United States
Abstract:
... A backpack sprayer for spraying arthropods or arthropod eggs, such as beneficial mites or beneficial insect eggs, or insect eggs containing parasitoids, directly onto plants is disclosed which uses excess air generated by a compressor to produce a coarse or fine spray of an aqueous suspension containing the arthropods or eggs as they exit from a spray gun. A stir bar magnet in a spray tank, contro ...
... A binomial model was used to describe aggregation for 8 mite species that were collected from an experimental apple orchard in 1990-1995. They included the plant-feeding spider mites Tetranychus urticae Koch (combined with Eotetranychus sp.), Panonychus ulmi (Koch), and Bryobia rubrioculus (Scheuten); the stigmaeid predator Zetzellia mali (Ewing); and the phytoseiid predators Amblyseius andersoni ...
... Interactions between weeds and arthropods occur frequently. This review covers the topic of weed/arthropod interactions, and provides the reader with access to literature in the subject area that is scattered in weed science, entomological, crop production, and ecological journals. We first analyze the current status of weed and arthropod management in the context of multidisciplinary integrated p ...
arthropod pests; surfaces; kaolin; calcium carbonate; particles; mixtures; pest control; repellents; patents; USDA; United States
Abstract:
... Disclosed is a method for protecting surfaces from arthropod infestation which involves treating the surface with an effective amount of finely divided calcined kaolins, hydrophobic calcined kaolins, hydrous kaolins, hydrophobic hydrous kaolins, hydrophobic calcium carbonates, calcium carbonates or mixtures thereof. ...
arthropod pests; mosquito control; insect traps; insect attractants; chemical composition; pesticide formulations; chemical structure; patents; USDA; United States
Abstract:
... Compositions and methods employing the compositions for attracting arthropods. The compositions comprise at least one compound of formula I and at least one compound from group II. ...
orchards; plant litter; population dynamics; Phytoseiidae; predatory arthropods; Persea americana; Scirtothrips perseae; leaves; Oligonychus; Araneae; predation; population density; Aeolothrips; arthropod pests; predator-prey relationships; California
Abstract:
... Abundance of Scirtothrips perseae Nakahara (Thysanoptera: Thripidae), Oligonychus perseae Tuttle, Baker & Abbatiello (Acari: Tetranychidae), predators, and associations among their population trends on avocado leaves and fruit were determined in three untreated avocado orchards in Ventura and Santa Barbara Counties, CA, from 1998 to 2000. Objectives were to understand pest-predator dynamics and to ...
Byturus; Otiorhynchus; Resseliella; Rubus idaeus; Tetranychus urticae; arthropod pests; canes; flowering; growers; industry; insecticides; integrated pest management; leaves; markets; midges; models; monitoring; odors; population size; predatory mites; shelf life; spring; traps; Northern European region; Switzerland; United Kingdom
Abstract:
... Reduced Application of Chemicals in European Raspberry Production ('RACER') was a 2-year project funded by EU-CRAFT/BBW (Switzerland) that brought together commercial and scientific partners from seven European countries. The aim was to develop suitable monitoring and/or forecasting methods to detect a range of arthropod pests of red raspberry (Rubus idaeus L.), and a standardised system to detect ...
Lepeophtheirus salmonis; acaricides; aquaculture; arthropod pests; crops; fish production; human health; insecticides; livestock; resistance management; risk; sustainable development; Canada; Northern European region
Abstract:
... In Northern Europe and Canada, the salmon louse, Lepeophtheirus salmonis (Krøyer), seriously affects the marine phase of salmon production. Although the problem is long-standing, the development of sustainable methods of pest management has been unable to keep pace with the intensification of production, leading to large-scale reliance on very few chemotherapeutants. This runs the risk of selectin ...
... In this study, acetylcholinesterases (AChEs) were extracted from two Mexican Boophilus microplus strains that demonstrated resistance to the organophosphate (OP) acaricide, coumaphos, in bioassay. The rate of inhibition of the extracted AChEs by the diethyl-OP paraoxon was determined for two resistant strains and two susceptible strains of B. microplus. The time to inhibition of 50% AChE activity ...
... Scorpion stings cause more morbidity in Mexico than any other country, leading to about 100 deaths annually. In 1999, the State of Morelos reported nine deaths among 30663 cases of scorpion sting. To replace lindane used for scorpion control, field trials of pyrethroid pesticides were undertaken in Morelos during 1998-2000 at the village of Chalcatzingo (population initially with 2760 inhabitants ...
... A large-scale demonstration to control arthropod pests of pear (Pyrus communis) in southern Oregon was conducted from 1995 through 1999. The project used orchard monitoring along with mating disruption for control of codling moth (Cydia pomonella L.) and three 1% v/v applications of a narrow-range petroleum spray oil during the foliar season. By these methods, we have been able to reduce organopho ...
... IPM programs have been developed and promoted for tropical tree and vegetable crops in the Northern Territory of Australia. These were based on educating farmers about the biology and ecology of the main arthropod pests and beneficials, cultural techniques, monitoring insects and the use of less disruptive pesticides. IPM practices were tested on cooperator properties over the past few years with ...
livestock; ectoparasites; arthropod pests; pest resistance; disease resistance; genetic resistance; immunity; disease control; vaccine development
Abstract:
... The majority of parasites affecting a herd of animals are harbored by a relatively few very susceptible hosts within the herd. Those few animals are responsible for maintenance and transmission of the parasite population to the more resistant animals. This observation has long held the promise of ectoparasite control by natural host resistance if the resistant phenotype could be selected for, or t ...
... Halotydeus destructor feeding on subterranean clover cotyledons can cause severe damage. The mites live on the soil surface and move up onto plants to feed. Foraging behaviour consists of palpating, probing, and feeding with frequent transitions between them. Sustained feeding is made up of a series of short (1-2 min) feeds separated by periods of palpating. The mites tend to feed in aggregations, ...
Hevea brasiliensis; Neozygites; Hirsutella thompsonii; forest trees; Verticillium; biological control agents; mites; new geographic records; species diversity; Cladosporium; arthropod pests; pathogens; biological control; Brazil
Abstract:
... During a study on the diversity of mites of agricultural importance, we made an inventory of pathogens infecting plant inhabiting and edaphic mites, mainly in the State of Sao Paulo, Brazil. Several species of Eriophyoidea were found to be infected by Hirsutella sp. Resting spores of Entomophthorales were observed in mites of the following families: Ascidae, Phytoseiidae, Stigmaeidae, Tetranychida ...
... Plants protect themselves from arthropod herbivores both directly, by expressing biochemical and morphological traits that interfere with herbivore development or behavior, and indirectly, by facilitating the action of natural enemies of herbivores. These direct and indirect resistance mechanisms are not always expressed at maximal levels by plants, but rather can be induced to higher levels by a ...
Ixodes pacificus; nymphs; population density; climatic factors; rain; air temperature; seasonal variation; habitats; animal ecology; disease vectors; arthropod pests; California
Abstract:
... In western North America, the tick Ixodes pacificus Cooley & Kohls (Acari: Ixodidae) is the primary vector to humans and domestic animals of the disease agents causing Lyme disease and granulocytic ehrlichiosis. We examined the seasonal activity patterns of I. pacificus nymphs over a 4-year period, including the wet and cold El Nino winter/spring of 1998, in a dry oak/madrone woodland, and for one ...
strawberries; Neoseiulus californicus; acaricide residues; Fragaria ananassa; chemical control; biological control agents; predatory mites; acaricide resistance; acaricides; integrated pest management; lethal dose; natural enemies; Tetranychus urticae; arthropod pests; females; biological control; Brazil
Abstract:
... This work aimed to evaluate the differential toxicity of pesticides to populations of the mite species Neoseiulus californicus (McGregor) and Tetranychus urticae Koch collected from commercial crops of strawberry (Fragaria sp.) in Atibaia county, State of Sao Paulo, Brazil. In the test of acute toxicity of pesticides, adult females of N. californicus received the pesticide treatment under Potter s ...
... Melaleuca quinquenervia (Cav.) S. T. Blake, the broad-leaved paperbark tree, has invaded ca. 202,000 ha in Florida, including portions of the Everglades National Park. We performed prerelease surveys in south Florida to determine if native or accidentally introduced arthropods exploit this invasive plant species and assess the potential for higher trophic levels to interfere with the establishment ...
... Silwet L-77, an organosilicone surfactant, was applied to several arthropod pests of California table grapes. Eggs of grape mealybug, Pseudococcus maritimus (Ehrhorn), and omnivorous leafroller, Platynota stultana Walsingham, were tolerant to 0.1, 0.25, and 0.5% treatment solutions; however, eggs of Pacific spider mite, Tetranychus pacificus McGregor, were highly susceptible with mortality >99.4% ...
... This study investigated the influence of different humidity levels on percentage of infection by Beauveria bassiana (Balsamo) Vuillemin (Hyphomycetes) (Botanigard Emulsifiable Suspension formulation) on greenhouse insect and mite pests, and their commercially available biological control agents. The target insect and mite species were sprayed with B. bassiana and evaluated in petri dish trials und ...
arthropod pests; arthropods; case studies; chronic exposure; control methods; cropping systems; decision making; disease vectors; farms; fungi; human health; human population; infectious diseases; information technology; insects; integrated pest management; livestock; management systems; natural resources; pest control; poverty; Sub-Saharan Africa
Abstract:
... In a sub-Saharan African context, limited natural resources, infectious diseases, including those transmitted by arthropod vectors, and chronic exposure to food contaminated with mycotoxin-producing fungi which, among others, are vectored by insects, are among the major constraints to human health. Thus, pest control should be an important component in human health improvement projects. It appears ...
life cycle (organisms); Caligidae; arthropod pests; developmental stages; lice infestations; fish diseases; Oncorhynchus mykiss
Abstract:
... Caligus rogercresseyi, [Contrib. Zool. 69 (2000) 137] is the only caligid known to affect the salmon industry in Southern Chile. Economic losses due to reduced fish quality, cost of chemical treatment and outbreaks of other diseases such as the Piscirickettsiosis occur. The life cycle of C. rogercresseyi is described in rainbow trout reared in seawater tanks from observations made under natural co ...
chemical composition; piperidines; Aedes albopictus; insect repellents; patents; Aedes aegypti; mammals; USDA; arthropod pests; stereoisomers; United States
Abstract:
... A method for selecting the most effective arthropod repellent from stereoisomers of a compound, involving testing each stereoisomer of the compound for its effectiveness as an arthropod repellent against an arthropod of a particular genus and species, comparing the test results and selecting the most effective arthropod repellent stereoisomer from the stereoisomers of the compound, wherein the com ...
... Sampling recommendations were developed for a potato bait sampling method used to estimate garden symphylan (Scutigerella immaculata Newport) densities in western Oregon. Sample size requirements were developed using Taylor's power law to describe the relationship between sample means and variances. Developed sampling recommendations performed well at sample sizes of 30 and greater, when validated ...
soil arthropods; Coleoptera; arthropod communities; fields; predatory arthropods; seasonal variation; species diversity; Araneae; population density; body size; predation; Opiliones; arthropod pests; population dynamics; juveniles; Austria
... Synthetic sugar esters are a relatively new class of insecticidal compounds that are produced by reacting sugars with fatty acids. The objective of this research was to determine how systematic alterations in sugar or fatty acid components of sugar ester compounds influenced their insecticidal properties. Sucrose octanoate, sorbitol octanoate, sorbitol decanoate, sorbitol caproate, xylitol octanoa ...
... The literature on controlled atmospheres (CA) for arthropod control on fresh horticultural perishables is summarized. Four basic approaches to control of arthropod pests are discussed, including regular CA storage, low temperature insecticidal CA, room temperature insecticidal CA, and high temperature insecticidal CA. Insecticidal CA (ICA) generally involves O2 concentrations below 2 kPa and/or CO ...
parasitoids; agricultural research; USDA; biological control agents; introduced species; research projects; predators; natural resource management; host seeking; host specificity; natural enemies; arthropod pests; mating behavior; biological control
Abstract:
... During 1999-2001, ARS scientists published over 100 papers on more than 30 species of insect pest and 60 species of predator and parasitoid. These papers address issues crucial to the three strategies of biological control: conservation, augmentation and introduction. Conservation biological control includes both conserving extant populations of natural enemies by using relatively non-toxic pestic ...
... One-, 2- and 3-day-old two-spotted spider mite eggs were treated with increasing doses of gamma radiation ranging from 0-280 Gy. Percent egg hatch decreased as radiation increased for each age group; however, older eggs required higher doses of radiation to prevent egg hatch than did younger eggs. Based on the regression lines for 1-, 2- and 3-day-old eggs, the best estimates of the doses of radia ...
Lygus lineolaris; Empoasca fabae; sampling; grapes; trapping; viticulture; Vitis; new geographic records; species diversity; Maladera castanea; population density; arthropod pests; population dynamics; Endopiza viteana; Quebec