Effects of Cytoplasmic Polyhedrosis Virus on the Corn Earworm, Helicorverpa Zea (Boddie) (Lepidoptera-Noctuidae) PDF Download

Author: Choon Fah Joseph Bong
Publisher:
ISBN:
Category :
Languages : en
Pages : 101

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Author: Choon Fah Joseph Bong
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 202

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Author: Erin Mary Marlow
Publisher:
ISBN:
Category :
Languages : en
Pages : 114

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Author: Christopher Glen Clemens
Publisher:
ISBN:
Category :
Languages : en
Pages : 220

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Author: Michael Benjamin Von Kanel
Publisher:
ISBN:
Category :
Languages : en
Pages : 72

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Transgenic corn and cotton expressing crystalline (Cry) insecticidal proteins from Bacillus thuringiensis (Bt) were commercially introduced in 1996. This technology has greatly improved the control of several key lepidopteran insect pests tobacco budworm, Heliothis virescens (Farbricius), pink bollworm, Pectinophora gossypiella (Saunders), southwestern corn borer, Diatraea grandiosella (Dyar), and European corn borer, Ostrinia nubilalis (Hübner). The corn earworm, Helicoverpa zea, has been more difficult to control using Bt crops and supplemental insecticide applications are often needed to prevent economic losses. A major threat to the longevity of transgenic technology is the evolution of resistance, especially when an insect pest infests both Bt corn and cotton in the same growing season. Similar Cry proteins are currently expressed in both corn and cotton commercial production systems. At least one generation per year develops on Bt corn before infesting cotton. Given that H. zea infests both crop hosts at some point every year, the objectives of this study were to evaluate the contribution and influence of Genuity VT3 PRO corn (expressing Cry1A.105 and Cry2Ab) on H. zea density, fitness, and selection on BollGard II cotton (expressing Cry1Ac and Cry2Ab). Non-Bt and VT3 PRO corn fields were sampled for larval density and any observed larvae were collected. Non-Bt field corn supported 61% more larvae compared to VT3 PRO fields. Larvae infesting non-Bt corn developed faster than those infesting VT3 PRO corn. Larvae collected from VT3 PRO corn had significantly higher pupal weight two out of the three years of this study. Pupae from VT3 PRO corn also had longer pupal duration two out of three years compared to pupae of larvae collected from non-Bt corn. Offspring from larvae reared on VT3 PRO corn had a higher LC50 compared to offspring from larvae reared on non-Bt corn. H. zea susceptibility to Bt is highly variable but the results presented here indicate that dual-gene corn hybrids such as VT3 PRO can select for H. zea populations with a higher propensity for causing damage in Bt cotton.

Author: P. P. Sikorowski
Publisher:
ISBN:
Category : Heliothis
Languages : en
Pages : 20

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Author: Dhananjaya Pratap Singh
Publisher: Springer
ISBN: 9811065934
Category : Science
Languages : en
Pages : 766

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This book puts an updated account on functional aspects of multiphasic microbial interactions within and between plants and their ecosystem. Multipronged interaction in the soil microbial communities with the plants constitute a relay of mechanisms that make profound changes in plant and its micro-environment in the rhizopshere at physiological, biochemical and molecular levels. In agro-ecological perspectives, such interactions are known to recycle nutrients and regulate signalling molecules, phytohormones and other small molecules that help plant growth and development. Such aspects are described deeply in this book taking examples from various crop plants and microbial systems. Authors described the most advantageous prospects of plant-microbe interaction in terms of inoculation of beneficial microorganisms (microbial inoculants) with the plants in which microbes proliferate in the root rhizosphere system and benefit plants' with definite functions like fixation of nitrogen, solubilization and mobilization of P, K, Zn and production of phytohormones. The subject of this book and the content presented herein has great relevance to the agro-ecological sustainability of crop plants with the help of microbial interactions. The chapters presented focus on defining and assessing the impact of beneficial microbial interactions on different soils, crops and abiotic conditions. This volume entails about exploiting beneficial microbial interactions to help plants under abiotic conditions, microbe-mediated induced systemic tolerance, role of mycorrhizal interactions in improving plant tolerance against stresses, PGPR as nutrient mobilizers, phytostimulants, antagonists and biocontrol agents, plant interactions with Trichoderma and other bioagents for sustainable intensification in agriculture, cyanobacteria as PGPRs, plant microbiome for crop management and phytoremediation and rhizoremediation using microbial communities. The overall content entrust advanced knowledge and applicability of diversified biotechnological, techno-commercial and agro-ecological aspects of microbial interactions and inoculants as inputs, which upon inoculation with crop plants benefit them in multiple ways.

Author: Jenny Kogan
Publisher:
ISBN:
Category : Heliothis virescens
Languages : en
Pages : 254

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Author:
Publisher:
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Category : Arthropod pests
Languages : en
Pages : 252

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Author: Mississippi Agricultural and Forestry Experiment Station
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 272

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