Results 161 to 170 of about 4,749 (197)

Susceptibility of Brazilian Populations of Helicoverpa armigera and Helicoverpa zea (Lepidoptera: Noctuidae) to Vip3Aa20

Journal of Economic Entomology, 2017
Transgenic maize expressing the insecticidal protein Vip3Aa20 is increasingly being adopted in Brazil. In this study, we determined the baseline susceptibility of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) and Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) to Vip3Aa20, as part of an Insect Resistance Management (IRM) program.
N A Leite, R M Pereira, M R Durigan, D Amado, J Fatoretto, F C L Medeiros, C Omoto   +6 more
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Cold Hardiness of Helicoverpa zea (Lepidoptera: Noctuidae) Pupae

Environmental Entomology, 2012
An insect's cold hardiness affects its potential to overwinter and outbreak in different geographic regions. In this study, we characterized the response of Helicoverpa zea (Boddie) pupae to low temperatures by using controlled laboratory measurements of supercooling point (SCP), lower lethal temperature (LT(50)), and lower lethal time (LLTime).
A C, Morey, W D, Hutchison, R C, Venette, E C, Burkness   +3 more
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Aflatoxin B1 detoxification by CYP321A1 in Helicoverpa zea

Archives of Insect Biochemistry and Physiology, 2008
AbstractThe polyphagous corn earworm Helicoverpa zea frequently encounters aflatoxins, mycotoxins produced by the pathogens Aspergillus flavus and A. parasiticus, which infect many of this herbivore's host plants. While aflatoxin B1 metabolism by midgut enzymes isolated from fifth instars feeding on control diets was not detected, this compound was ...
Guodong, Niu, Zhimou, Wen, Sanjeewa G, Rupasinghe, Ren Sen, Zeng, May R, Berenbaum, Mary A, Schuler   +5 more
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Forecasting the population of the corn earworm Helicoverpa zea

IJCNN'01. International Joint Conference on Neural Networks. Proceedings (Cat. No.01CH37222), 2002
The corn earworm (CEW) is significant pest for major crops such as soybean and corn. An accurate forecast of its population will be of great benefit to farmers, who must allocate a correct percentage of their land to trap crops. We apply statistical and neural network methods to estimate future populations based upon historical data.
N. Elgaddel, F.C. Lin, M. Nobakht, D. Okunbor   +3 more
openaire   +1 more source

Sequestration of host plant carotenoids in the larval tissues of Helicoverpa zea

Journal of Insect Physiology, 2002
To determine the cause of the unique yellow coloration in mandibular glands of soybean-fed Helicoverpa zea larvae, the accumulation of carotenoids in various tissues of last instar larvae fed soybean, cotton and tomato foliage was quantified. Five carotenoids were detected in the foliage of all host plants but at significantly different concentrations.
H, Eichenseer, J B., Murphy, G W., Felton   +2 more
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Local dispersal of male Helicoverpa zea

Entomologia Experimentalis et Applicata, 1995
AbstractLocal dispersal of Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) males as they emerged following the F1 and F2 generations in dent corn was examined in a 4 km diam. area in South Carolina, USA. Males were marked at artificial nectar feeding stations using RbCl, and recovered in traps baited with a synthetic pheromone.
openaire   +1 more source

Efficient isolation, purification, and characterization of the Helicoverpa zea VHDL receptor

Protein Expression and Purification, 2003
The study of fat body receptors (e.g., VHDL receptor) in Lepidoptera has been irksome due to the fact that isolation and purification of these proteins are difficult and resulted in extremely low yields. A rapid and efficient method is presented for the purification of Helicoverpa zea VHDL receptor by the use of VHDL-biotin ligand complexed to ...
Deryck R, Persaud, Vandad, Yousefi, Norbert, Haunerland   +2 more
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Effect of Racemic and (+)- and (−)-Gossypol on the Survival and Development of Helicoverpa zea Larvae

Journal of Chemical Ecology, 2006
Gossypol is a sesquiterpene that occurs naturally in seed and other parts of the cotton plant. Because of restricted rotation around the binaphthyl bond, it occurs naturally as enantiomeric mixtures with (+)-gossypol to (-)-gossypol ratios that vary between 97:3 and 31:69. Commercial cotton varieties (Gossypium hirsutum) normally exhibit an approximate
Robert D, Stipanovic, Juan D, Lopez, Michael K, Dowd, Lorraine S, Puckhaber, Sara E, Duke   +4 more
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The surface hydrocarbons of larval Heliothis virescens and Helicoverpa zea

Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 1995
Abstract Third instar larvae of Heliothis virescens and Helicoverpa zea could be distinguished based on the hydrocarbons of their surface lipids. Hydrocarbons were the major components of the surface lipids and a distinctive capillary gas chromatographic profile could be obtained from a hexane extract of the surface lipids of a single larva ...
Dennis R. Nelson, James S. Buckner
openaire   +1 more source

Enhancement of Indices of Viral Infection by Simultaneously Administering Helicoverpa zea and Autographa californica Nuclear Polyhedrosis Viruses to Larval Helicoverpa zea (Boddie)

Journal of Invertebrate Pathology, 1995
Abstract Corn earworm, Helicoverpa zeo (Boddie), were simultaneonsly administered Heliothis zea and Authographa californica nuclear polyhedrosis viruses (HzSNPV and AcMNPV, respectively). These viruses are classified within the Baculoviridae (subfamily Eubaculovirinae) and are known to he pathogenic to H. zea.
C.N. Arne, G.L. Nordin
openaire   +1 more source