Response of Helicoverpa zea (Lepidoptera: Noctuidae) Populations to Canopy Development in Soybean as Influenced by Heterodera glycines (Nematoda: Heteroderidae) and Annual Weed Population Densities

1991 ◽  
Vol 84 (1) ◽  
pp. 267-276 ◽  
Author(s):  
Diane G. Alston ◽  
J. R. Bradley ◽  
D. P. Schmitt ◽  
H. D. Coble
Keyword(s):  
Helicoverpa Zea ◽  
Heterodera Glycines ◽  
Population Densities ◽  
Canopy Development ◽  
Weed Population ◽  
Lepidoptera Noctuidae

Attraction of Heliothis belladonna (Henry and Edwards) to the Sex Pheromone of the Corn Earworm Moth, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae)

2006 ◽  
Vol 79 (4) ◽  
pp. 303-308 ◽  
Author(s):  
Peter J. Landolt ◽  
Constance L. Smithhisler ◽  
Richard S. Zack ◽  
Leonardo Camelo
Keyword(s):  
Sex Pheromone ◽  
Helicoverpa Zea ◽  
Corn Earworm ◽  
Lepidoptera Noctuidae

Incidence of Helicoverpa armigera (Lepidoptera: Noctuidae) and its natural enemies on smallholder crops in Kenya

1993 ◽  
Vol 83 (3) ◽  
pp. 321-328 ◽  
Author(s):  
H. van den Berg ◽  
M. J. W. Cock ◽  
G. I. Oduor ◽  
E. K. Onsongo
Keyword(s):  
Helicoverpa Armigera ◽  
Heliothis Armigera ◽  
Population Densities ◽  
Parasitoid Species ◽  
Larval Parasitoid ◽  
Total Percentage ◽  
Four Seasons ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae ◽  
Experimental Plots

AbstractSmallholder crops (sunflower, maize, sorghum and cotton) were grown in experimental plots at seven sites, representing different agricultural zones of Kenya, over four seasons. Helicoverpa armigera (Hübner) (formerly Heliothis armigera) only occasionally achieved population densities sufficient to cause obvious damage to the crops, and was virtually absent from the coastal sites. At the inland sites, infestation and mortality levels varied greatly. Information is presented on the incidence of H. armigera, and the identity, distribution and frequency of its common parasitoids and (potential) predators, sampled in the experimental plots. Trichogrammatoidea spp., egg parasitoids, and Linnaemya longirostris (Macquart), a tachinid late-larval parasitoid, were the most common parasitoid species, but total percentage parasitism was rather low. Of the large complex of predators, only anthocorids and ants (predominantly Pheidole spp., Myrmicaria spp. and Camponotus spp.) were sufficiently common and widespread to be of importance in suppressing H. armigera. The abundance of predators fluctuated widely between sites, but anthocorids were most abundant at the western sites.

scholarly journals Growth of a clonal cell line of Helicoverpa zea (Lepidoptera: Noctuidae) in suspension culture and replication of its homologous baculovirus HzSNPV.

2001 ◽  
Vol 36 (3) ◽  
pp. 349-352 ◽  
Author(s):  
Arthur H. McIntosh ◽  
James J. Grasela ◽  
Cynthia L. Goodman ◽  
Carlo M. Ignoffo
Keyword(s):  
Suspension Culture ◽  
Cell Line ◽  
Helicoverpa Zea ◽  
Clonal Cell Line ◽  
Clonal Cell ◽  
Lepidoptera Noctuidae

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

Correlation between Soil pH, Heterodera glycines Population Densities, and Soybean Yield

Crop Science ◽  
2010 ◽  
Vol 50 (4) ◽  
pp. 1458-1464 ◽  
Author(s):  
P. Pedersen ◽  
G. L. Tylka ◽  
A. Mallarino ◽  
A. E. Macguidwin ◽  
N. C. Koval ◽  
...  
Keyword(s):  
Soil Ph ◽  
Heterodera Glycines ◽  
Population Densities ◽  
Soybean Yield

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.

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