Landscape‐level variation in Bt crops predict Helicoverpa zea (Lepidoptera: Noctuidae) resistance in cotton agroecosystems

2021 ◽  
Author(s):  
Seth J Dorman ◽  
Kristen A Hopperstad ◽  
Brian J Reich ◽  
Suman Majumder ◽  
George Kennedy ◽  
...  
Keyword(s):  
Helicoverpa Zea ◽  
Level Variation ◽  
Bt Crops ◽  
Lepidoptera Noctuidae ◽  
Landscape Level

Landscape-level variation in forest structure and biogeochemistry across a substrate age gradient in Hawaii

Ecology ◽  
2009 ◽  
Vol 90 (11) ◽  
pp. 3074-3086 ◽  
Author(s):  
Peter Vitousek ◽  
Gregory P. Asner ◽  
Oliver A. Chadwick ◽  
Sara Hotchkiss
Keyword(s):  
Forest Structure ◽  
Level Variation ◽  
Substrate Age ◽  
Substrate Age Gradient ◽  
Landscape Level

scholarly journals Detection and Evolution of Resistance to the Pyrethroid Cypermethrin in Helicoverpa zea (Lepidoptera: Noctuidae) Populations in Texas

2007 ◽  
Vol 36 (5) ◽  
pp. 1174-1188 ◽  
Author(s):  
P. V. Pietrantonio ◽  
T. A. Junek ◽  
R. Parker ◽  
D. Mott ◽  
K. Siders ◽  
...  
Keyword(s):  
Helicoverpa Zea ◽  
Evolution Of Resistance ◽  
Lepidoptera Noctuidae

Helicoverpa zea (Lepidoptera: Noctuidae) Preference for Plant Structures, and Their Location, Within Bt Cotton Under Different Nitrogen and Irrigation Regimes

2019 ◽  
Vol 112 (4) ◽  
pp. 1741-1751
Author(s):  
Lewis R Braswell ◽  
Dominic D Reisig ◽  
Clyde E Sorenson ◽  
Guy D Collins
Keyword(s):  
Helicoverpa Zea ◽  
Resistance Management ◽  
Larval Feeding ◽  
Bt Cotton ◽  
Larval Distribution ◽  
Cotton Plants ◽  
Small Plot ◽  
Nitrogen Treatments ◽  
Behavioral Resistance ◽  
Lepidoptera Noctuidae

Abstract Helicoverpa zea Boddie is a common economic pest of cotton (Gossypium hirsutum L.), including transgenic cotton varieties that express Bacillus thuringiensis (Bt). Helicoverpa zea oviposition is similar in Bt and non-Bt cotton, but behavior of H. zea larvae can be different in the presence of Bt, with neonates moving away from terminals faster in single-toxin Bt than non-Bt cotton or avoiding Bt-treated diet in the lab. We quantified H. zea oviposition and larval distribution on structures within cotton plants in small plot experiments of Cry1Ac + Cry1F cotton for 2 yr under different irrigation and nitrogen treatments. More eggs were oviposited on plants receiving nitrogen application during 2016 and on leaves in the top section of irrigated plants during 2017, but other treatment effects on eggs or larvae were minimal. Helicoverpa zea eggs were most common on leaves in the top third of plants at position zero and middle section of cotton plants throughout the season, but some oviposition occurred on fruiting structures as well. First and second instars were more common on squares in the top section of plants during 2016 and bolls in the middle and lower sections during 2017 due to oviposition lower in the canopy during 2017. During both years, third through fifth instars were more common on bolls in the middle and lower section of plants closer to the main stem. These findings have resistance management implications as extended larval feeding on bolls could optimize nutrition, decrease Bt susceptibility, and potentially influence behavioral resistance.

scholarly journals Differences between two populations of bollworm, Helicoverpa zea (Lepidoptera: Noctuidae), with variable measurements of laboratory susceptibilities to Bt toxins exposed to non-Bt and Bt cottons in large field cages

PLoS ONE ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. e0212567 ◽  
Author(s):  
Nathan S. Little ◽  
Blake H. Elkins ◽  
R. Michelle Mullen ◽  
Omaththage P. Perera ◽  
Katherine A. Parys ◽  
...  
Keyword(s):  
Helicoverpa Zea ◽  
Large Field ◽  
Bt Toxins ◽  
Lepidoptera Noctuidae ◽  
Two Populations
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