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You searched for: Subject Helicoverpa zea Remove constraint Subject: Helicoverpa zea Subject hybrids Remove constraint Subject: hybrids
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1. Combining Ability of Husk Extension, Maysin Content, and Corn Earworm Resistance

Author:
Virginia M. Moore; William F. Tracy
Source:
Journal of the American Society for Horticultural Science 2021 v.146 no.1 pp. 14-23
ISSN:
2327-9788
Subject:
Helicoverpa zea; Zea mays; corn; cultivars; females; flavones; horticulture; hulls; hybrids; inbreeding; males; maysin; pests; sweetcorn
Abstract:
... Corn earworm (Helicoverpa zea) is a destructive pest with limited management options in sweet corn (Zea mays) production. Increased husk extension and the presence of the C-glycosyl flavone maysin are two proposed mechanisms for improving corn earworm resistance in corn cultivars. A factorial mating design was conducted to test hybrid combinations of sweet corn inbreds with long husks and/or maysi ...
DOI:
10.21273/JASHS04974-20

2. Survey of the farmer's fields for studying the infestation caused by fall army worm and corn earworm in Bundelkhand region

Author:
Vijay Kumar Mishra; Usha; Amit Tomar; Sandeep Upadhyay; S.S. Singh; Vishnu Kumar; S.K. Chaturvedi
Source:
Journal of entomological research 2021 v.45 no.3 pp. 482-485
ISSN:
0974-4576
Subject:
Helicoverpa zea; Spodoptera frugiperda; corn; farmers; hybrids; research; surveys
Abstract:
... A Field surveys carried out in different villages of Bundelkhand region indicated varied level of pest incidence and damage on maize crop. Insect pests like fall army worm and cob earworm (H. armigera) were recorded as major insect pests infesting maize during the survey. Maximum infestation was found in Sanora-Datia at a growing stage while the minimum infestation was observed in Panchumpura-Tika ...
DOI:
10.5958/0974-4576.2021.00075.X

3. Decline in Sublethal Effects of Bt Corn on Corn Earworm (Lepidoptera: Noctuidae) Linked to Increasing Levels of Resistance

Author:
Francis P F Reay-Jones; Thomas R Bilbo; Dominic D Reisig
Source:
Journal of Economic Entomology pp. -
ISSN:
0022-0493
Subject:
Bacillus thuringiensis; Helicoverpa zea; Zea mays; corn; decline; entomology; genetic engineering; hybrids; longitudinal studies; pupae; sublethal effects; North Carolina; South Carolina
Abstract:
... As part of an ongoing longitudinal study in North and South Carolina, this study reports the recovery of Helicoverpa zea (Boddie) pupae in field trials with genetically engineered corn, Zea mays L., hybrids that produce insecticidal toxins from Bacillus thuringiensis (Bt) in 2017–2019. In total, 10,400 corn ears were collected, which led to 3,927 H. zea pupae (2,215 in South Carolina and 1,712 in ...
DOI:
10.1093/jee/toaa163
CHORUS:
10.1093/jee/toaa163

4. Evaluation of Insecticide Thresholds in Late-Planted Bt and Non-Bt Corn for Management of Fall Armyworm (Lepidoptera: Noctuidae)

Author:
Tom R. Bilbo; Francis P. F. Reay-Jones; Jeremy K. Greene
Source:
Journal of economic entomology 2020 v.113 no.2 pp. 814-823
ISSN:
0022-0493
Subject:
Bacillus thuringiensis; Helicoverpa zea; Spodoptera frugiperda; corn; durability; entomology; genetically modified organisms; grain yield; hybrids; insecticide application; insecticides; leaves; pests; South America; South Carolina
Abstract:
... The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a major pest of corn in North and South America. It is managed primarily with transgenic corn-producing insecticidal proteins of Bacillus thuringiensis (Bt), but the development of resistance threatens their durability and necessitates the use of alternative management strategies. We conducted late-planted field trials during 2016 and 2017 ...
DOI:
10.1093/jee/toz364
CHORUS:
10.1093/jee/toz364

5. Association of Insect-Derived Ear Injury With Yield and Aflatoxin of Maize Hybrids Varying in Bt Transgenes

Author:
Luke S. Pruter; Michael J. Brewer; Mark A. Weaver; Seth C. Murray; Thomas S. Isakeit; Julio S. Bernal
Source:
Environmental entomology 2019 v.48 no.6 pp. 1401-1411
ISSN:
0046-225X
Subject:
Bacillus thuringiensis; Helicoverpa zea; Spodoptera frugiperda; Zea mays; aflatoxins; bacterial proteins; corn; corn ears; crop production; data collection; environmental factors; genetic background; genetically modified organisms; hybrids; insects; transgenes; water stress; Texas
Abstract:
... Environmental factors have been associated with the production of aflatoxin in maize, Zea mays L., and it is inconclusive whether transgenic, Bacillus thuringiensis (Bt), maize has an impact on aflatoxin accumulation. Maize hybrids differing in transgenes were planted in two locations from 2014 to 2017. Yield, aflatoxin, and ear injury caused by corn earworm, Helicoverpa zea (Boddie), and fall arm ...
DOI:
10.1093/ee/nvz112

6. Yield, Insect-Derived Ear Injury, and Aflatoxin Among Developmental and Commercial Maize Hybrids Adapted to the North American Subtropics

Author:
Luke S. Pruter; Michael J. Brewer; Seth C. Murray; Thomas Isakeit; Jacob J. Pekar; Nancy J. Wahl
Source:
Journal of economic entomology 2020 v.113 no.6 pp. 2950-2958
ISSN:
0022-0493
Subject:
Aspergillus flavus; Deuteromycotina; Helicoverpa zea; Spodoptera frugiperda; Zea mays; aflatoxins; corn; entomology; genetics; heat; herbivores; hybrids; inbred lines; insect resistance; insects; testcrosses; weather; Bolivia
Abstract:
... The development of maize (Zea mays L.) hybrids that are adapted to subtropical areas of North America should consider yield potential under heat and moisture stress, and reduced susceptibility to insect herbivory and disease. To aid in this process, maize hybrids (43 developmental and seven non-Bt commercial hybrids) were evaluated for severity of ear injury to Helicoverpa zea (Boddie) and Spodopt ...
DOI:
10.1093/jee/toaa207
CHORUS:
10.1093/jee/toaa207

7. Bt Resistance Implications for Helicoverpa zea (Lepidoptera: Noctuidae) Insecticide Resistance Management in the United States

Author:
Dominic D Reisig; Ryan Kurtz
Source:
Environmental entomology 2018 v.47 no.6 pp. 1357-1364
ISSN:
1938-2936
Subject:
Bacillus thuringiensis; Helicoverpa zea; Zea mays; corn; cotton; crops; crystal proteins; cultivars; genetic engineering; genetic traits; growers; hosts; hybrids; insecticide resistance; models; pest management; prices; resistance management; toxins; transgenic plants; United States
Abstract:
... Both maize and cotton genetically engineered to express Bt toxins are widely planted and important pest management tools in the United States. Recently, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) has developed resistance to two toxin Bt maize and cotton (Cry1A and Cry2A). Hence, growers are transitioning to three toxin Bt cotton and maize that express both Cry toxins and the Vip3Aa toxin. H ...
DOI:
10.1093/ee/nvy142

8. Decreased Cry1Ac activation by midgut proteases associated with Cry1Ac resistance in Helicoverpa zea

Author:
Min Zhang; Jizhen Wei; Xinzhi Ni; Jie Zhang; Juan L Jurat‐Fuentes; Jeffrey A Fabrick; Yves Carrière; Bruce E Tabashnik; Xianchun Li
Source:
Pest management science 2019 v.75 no.4 pp. 1099-1106
ISSN:
1526-498X
Subject:
Bacillus thuringiensis; Helicoverpa zea; alkaline phosphatase; brush border membrane vesicles; chymotrypsin; crystal proteins; genes; hybrids; liquids; membrane alanyl aminopeptidase; midgut; pest management; toxicity; toxins; transcription (genetics); trypsin; Georgia
Abstract:
... BACKGROUND: Field‐evolved resistance of Helicoverpa zea to Bacillus thuringiensis (Bt) toxin Cry1Ac was first reported more than a decade ago, yet the underlying mechanisms remain elusive. Towards understanding the mechanisms of resistance to Cry1Ac, we analyzed a susceptible (LAB‐S) and two resistant (GA and GA‐R) strains of H. zea. The GA strain was derived from Georgia and exposed to Bt toxins ...
DOI:
10.1002/ps.5224
CHORUS:
10.1002/ps.5224

9. Impact of Corn Earworm (Lepidoptera: Noctuidae) on Field Corn (Poales: Poaceae) Yield and Grain Quality

Author:
Jenny L Bibb; Donald Cook; Angus Catchot; Fred Musser; Scott D Stewart; Billy Rogers Leonard; G David Buntin; David Kerns; Tom W Allen; Jeffrey Gore
Source:
Journal of economic entomology 2018 v.111 no.3 pp. 1249-1255
ISSN:
1938-291X
Subject:
Bacillus thuringiensis; Diatraea grandiosella; Helicoverpa zea; Zea mays; aflatoxins; corn; crop yield; economic valuation; ecosystems; grain quality; hybrids; insect control; insect larvae; insect pests; insecticides; pesticide application; seeds; styles (flowers); transgenic plants; Southeastern United States
Abstract:
... Corn earworm, Helicoverpa zea (Boddie), commonly infests field corn, Zea mays (L.). The combination of corn plant biology, corn earworm behavior in corn ecosystems, and field corn value renders corn earworm management with foliar insecticides noneconomical. Corn technologies containing Bacillus thuringiensis (Bt) Berliner (Bacillales: Bacillaceae) were introduced that exhibit substantial efficacy ...
DOI:
10.1093/jee/toy082

10. Sampling Transgenic Corn Producing Bt Toxins for Corn Earworm Injury

Author:
Francis P F Reay-Jones; Thomas R Bilbo; Dominic D Reisig
Source:
Journal of economic entomology 2018 v.111 no.3 pp. 1446-1453
ISSN:
1938-291X
Subject:
Bacillus thuringiensis; Helicoverpa zea; Zea mays; corn; corn ears; hybrids; insecticidal proteins; isogenic lines; sample size; seeds; toxins; transgenic plants; variance; South Carolina
Abstract:
... Transgenic corn, Zea mays L., hybrids expressing insecticidal proteins from Bacillus thuringiensis (Bt) and non-Bt near isolines were sampled for injury from Helicoverpa zea (Boddie) in North and South Carolina from 2012 to 2017. A total of 7,260 ears were sampled, with an average kernel injury from H. zea feeding of 1.22 ± 0.02 (SEM) cm². The χ² statistics for observed and Poisson predicted distr ...
DOI:
10.1093/jee/toy099

11. Yield Losses in Transgenic Cry1Ab and Non-Bt Corn as Assessed Using a Crop-Life-Table Approach

Author:
Gerson A Silva; Marcelo C Picanço; Lino R Ferreira; Dalton O Ferreira; Elizeu S Farias; Thadeu C Souza; Nilson Rodrigues-Silva; Eliseu José G Pereira
Source:
Journal of economic entomology 2018 v.111 no.1 pp. 218-226
ISSN:
1938-291X
Subject:
Bacillus thuringiensis; Euxesta; Forficulidae; Helicoverpa zea; Spodoptera frugiperda; Zea mays; corn; crystal proteins; cultivars; field experimentation; hybrids; insect larvae; life tables; natural enemies; pest management; predatory insects; seeds; toxins; transgenic plants; yield components
Abstract:
... In this study, we constructed crop life tables for Bacillus thuringiensis Berliner (Bt) Cry1Ab and non-Bt corn hybrids, in which yield-loss factors and abundance of predaceous arthropods were recorded during 2 yr at two locations. Corn kernel/grain was the yield component that had the heaviest losses and that determined the overall yield loss in the corn hybrids across years and locations. Yield l ...
DOI:
10.1093/jee/tox346

12. Effects of Bt Corn on the Development and Fecundity of Corn Earworm (Lepidoptera: Noctuidae)

Author:
Tom R Bilbo; Francis P F Reay-Jones; Dominic D Reisig; Fred R Musser; Jeremy K Greene
Source:
Journal of economic entomology 2018 v.111 no.5 pp. 2233-2241
ISSN:
1938-291X
Subject:
Bacillus thuringiensis; Helicoverpa zea; Zea mays; bacteria; corn; crops; crystal proteins; eggs; fecundity; females; hybrids; insect resistance; insecticidal proteins; landscapes; males; models; pupae; resistance management; risk management; toxins; transgenic plants; viability; Mississippi; North Carolina; South Carolina
Abstract:
... The corn earworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), is only moderately susceptible to most toxins from the bacterium Bacillus thuringiensis (Bt) expressed in transgenic corn. To better understand the impact of Bt corn on the life cycle of H. zea, we collected pupae of H. zea during 2014–2016 in North Carolina, South Carolina, and Mississippi from corn hybrids expressing Cry1Ab, Cr ...
DOI:
10.1093/jee/toy203

13. Global challenges faced by engineered Bacillus thuringiensis Cry genes in soybean (Glycine max L.) in the twenty-first century

Author:
Louis Bengyella; Elsie Laban Yekwa; Sehrish Iftikhar; Kiran Nawaz; Robinson C. Jose; Dobgima J. Fonmboh; Ernest Tambo; Pranab Roy
Source:
3 Biotech 2018 v.8 no.11 pp. 464
ISSN:
2190-572X
Subject:
Anticarsia gemmatalis; Bacillus thuringiensis; Erebidae; Glycine max; Helicoverpa armigera; Helicoverpa gelotopoeon; Helicoverpa zea; Pseudoplusia includens; RNA interference; Spodoptera albula; Spodoptera eridania; Spodoptera frugiperda; Telenomus; Tortricidae; compliance; crystal proteins; durability; genes; good agricultural practices; hybrids; insect pests; insect resistance; insecticides; soybeans; toxins; transgenic plants
Abstract:
... The most important insect pests causing severe economic damages to soybean (Glycine max L.) production worldwide are Chrysodeixis includens (Walker, Noctuidae), Anticarsia gemmatalis (Hübner, Erebidae), Helicoverpa gelotopoeon (Dyar, Noctuidae), Crocidosema aporema (Walsingham; Tortricidae), Spodoptera albula (Walker, Noctuidae), S. cosmiodes (Walker, Noctuidae), S. eridania (Stoll, Noctuidae), S. ...
DOI:
10.1007/s13205-018-1484-8
PubMed:
30402366
PubMed Central:
PMC6206324

14. Integration of biological control and transgenic insect protection for mitigation of mycotoxins in corn

Author:
Mark A. Weaver; Hamed K. Abbas; Michael J. Brewer; Luke S. Pruter; Nathan S. Little
Source:
Crop protection 2017 v.98 pp. 108-115
ISSN:
0261-2194
Subject:
Aspergillus flavus; Helicoverpa zea; aflatoxins; biological control; corn; economic factors; field experimentation; financial economics; fumonisins; hybrids; insects; soil treatment; transgenic insects; transgenic plants
Abstract:
... Biological control is known to be effective in reducing aflatoxin contamination of corn, and some transgenic corn hybrids incur reduced damage from corn earworm (Helicoverpa zea) than comparable non-Bt hybrids. We conducted seven field trials over two years to test the hypothesis that transgenic insect protection and biological control could be integrated to prevent mycotoxin contamination of corn ...
Handle:
10113/5655192
DOI:
10.1016/j.cropro.2017.03.020

15. Pan-American Similarities in Genetic Structures of Helicoverpa armigera and Helicoverpa zea (Lepidoptera: Noctuidae) With Implications for Hybridization

Author:
N. A. Leite; A. S. Correa; A. P. Michel; A. Alves-Pereira; V.A.C. Pavinato; M. I. Zucchi; C. Omoto
Source:
Environmental entomology 2017 v.46 no.4 pp. 1024-1034
ISSN:
0046-225X
Subject:
Helicoverpa armigera; Helicoverpa zea; alleles; crops; gene flow; genetic structure; genetic variation; hybridization; hybrids; indigenous species; insect pests; invasive species; microsatellite repeats; phylogeny; population structure; vegetables; Brazil; United States
Abstract:
... The genus Helicoverpa (Lepidoptera: Noctuidae) includes phytophagous and polyphagous agricultural insect pests. In the Americas, a native pest, Helicoverpa zea (Boddie), and an invasive pest, Helicoverpa armigera (Hübner), are causing severe damage in vegetable and agronomic crops. The population structure of both species in South America is poorly understood, and the phylogenetic relatedness of H ...
DOI:
10.1093/ee/nvx088

16. Combining Tpi and CO1 Genetic Markers to Discriminate Invasive Helicoverpa armigera From Local Helicoverpa zea (Lepidoptera: Noctuidae) Populations in the Southeastern United States

Author:
Rodney N. Nagoshi; Todd M. Gilligan; Julieta Brambila
Source:
Journal of economic entomology 2016 v.109 no.5 pp. 2115-2124
ISSN:
0022-0493
Subject:
DNA; Helicoverpa armigera; Helicoverpa zea; cytochrome-c oxidase; genes; genetic markers; genetic variation; hybridization; hybrids; insect infestations; insect pests; invasive species; mitochondria; monitoring; nucleotide sequences; pesticides; phylogeny; risk; sibling species; triose-phosphate isomerase; Australia; Europe; Florida; Morocco; South America
Abstract:
... The recent establishment of the Old World pest Helicoverpa armigera (Hübner) into South America has had significant economic consequences and places the rest of the hemisphere at risk, emphasizing the need for improved methods of monitoring. A major complication is that a sibling species endemic to the New World, Helicoverpa zea (Boddie), is morphologically very similar, with the two species capab ...
DOI:
10.1093/jee/tow177

17. Tolerance to Stalk and Ear-Invading Worms and Yield Performance of Bt and Conventional Corn Hybrids

Author:
Guihua Chen; Cerruti R. R. Hooks; Terry W. Patton; Robert Kratochvil; Galen Dively
Source:
Agronomy journal 2016 v.108 no.1 pp. 73-84
ISSN:
0002-1962
Subject:
Bacillus thuringiensis; Helicoverpa zea; Ostrinia nubilalis; Zea mays; agronomy; bacteria; corn; decision making; ears; genetically modified organisms; hybrids; Maryland
Abstract:
... European corn borer (ECB, Ostrinia nubilalis Hübner) and corn earworm (CEW, Helicoverpa zea Boddie) are important yield-reducing insect pests of field corn (Zea mays L. var. indentata) in the northeastern United States. Transgenic hybrids bioengineered to express insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) have revolutionized methods to control these caterpillars and other ...
DOI:
10.2134/agronj15.0139

18. Cross-resistance to toxins used in pyramided Bt crops and resistance to Bt sprays in Helicoverpa zea

Author:
Kara L. Welch; Gopalan C. Unnithan; Ben A. Degain; Jizhen Wei; Jie Zhang; Xianchun Li; Bruce E. Tabashnik; Yves Carrière
Source:
Journal of invertebrate pathology 2015 v.132 pp. 149-156
ISSN:
0022-2011
Subject:
Bacillus thuringiensis; Helicoverpa zea; amino acid sequences; crops; cross resistance; evolution; farmers; hybrids; insect pests; instars; larvae; median effective concentration; mortality; sequence homology; spores; toxins; transgenic plants
Abstract:
... To delay evolution of resistance by insect pests, farmers are rapidly increasing their use of transgenic crops producing two or more Bacillus thuringiensis (Bt) toxins that kill the same pest. A key condition favoring durability of these “pyramided” crops is the absence of cross-resistance between toxins. Here we evaluated cross-resistance in the major lepidopteran pest Helicoverpa zea (Boddie) to ...
DOI:
10.1016/j.jip.2015.10.003

19. The Impact of Inter-Kernel Movement in the Evolution of Resistance to Dual-Toxin Bt-Corn Varieties in Helicoverpa zea (Lepidoptera: Noctuidae)

Author:
Michael A. Caprio; Jeannette C. Martinez; Patrick A. Porter; Ed Bynum
Source:
Journal of economic entomology 2015 v.109 no.1 pp. 307-319
ISSN:
0022-0493
Subject:
Bacillus thuringiensis; Helicoverpa zea; Zea mays; alleles; cross pollination; crystal proteins; evolution; habitats; heterozygosity; hybrids; insect larvae; insecticide resistance; insects; models; pollen; pollen flow; seeds; toxins; transgenic plants
Abstract:
... Seeds or kernels on hybrid plants are primarily F₂ tissue and will segregate for heterozygous alleles present in the parental F₁ hybrids. In the case of plants expressing Bt-toxins, the F₂ tissue in the kernels will express toxins as they would segregate in any F₂ tissue. In the case of plants expressing two unlinked toxins, the kernels on a Bt plant fertilized by another Bt plant would express an ...
DOI:
10.1093/jee/tov295

20. Impact of Lepidoptera (Crambidae, Noctuidae, and Pyralidae) Pests on Corn Containing Pyramided Bt Traits and a Blended Refuge in the Southern United States

Author:
F. P. F. Reay-Jones; R. T. Bessin; M. J. Brewer; D. G. Buntin; A. L. Catchot; D. R. Cook; K. L. Flanders; D. L. Kerns; R. P. Porter; D. D. Reisig; S. D. Stewart; M. E. Rice
Source:
Journal of economic entomology 2016 v.109 no.4 pp. 1859-1871
ISSN:
0022-0493
Subject:
Bacillus thuringiensis; Diatraea grandiosella; Helicoverpa zea; Pyralidae; Spodoptera frugiperda; Zea mays; corn; corn ears; hybrids; insect pests; leaves; plant damage; planting date; resistance management; seeds; toxins; transgenic plants; Mississippi
Abstract:
... Blended refuge for transgenic plants expressing Bacillus thuringiensis (Bt) toxins has been approved in the northern United States as a resistance management strategy alternative to a structured refuge. A three-year study (2012–2014) was conducted with 54 trials across nine states in the southern United States to evaluate plant injury from lepidopteran pests of corn and yield in a corn hybrid expr ...
DOI:
10.1093/jee/tow109