Relative Abundance ofHelicoverpa armigera(Lepidoptera: Noctuidae) on Different Host Crops in India and the Role of These Crops as Natural Refuge forBacillus thuringiensisCotton

Ravi, K.C.; Mohan, K. S.; Manjunath, T. M.; Head, Graham P.; Patil, B. V.; Greba, D. P. Angeline; Premalatha, K.; Peter, John A.; Rao, N. G. V.

doi:10.1603/0046-225x-34.1.59

Cited by 60 publications

(38 citation statements)

References 18 publications

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“…The probability of moths from different host plants mating with each other will be very high because of the diverse cropping systems, wild host plants, small land holdings and H. armigera biology. Studies conducted by Ravi et al (2005) indicated that all of these host crops supported eggs and larvae of H. armigera at the same time as cotton thus serving as natural refuges for Bt cotton. Nevertheless, the Indian government has stipulated structural refugia of non-Bt cotton around the Bt cotton as a resistance management strategy.…”

Section: Bt Resistance Management For H Armigera In Cottonmentioning

confidence: 99%

Helicoverpa armigera baseline susceptibility to Bacillus thuringiensis Cry toxins and resistance management for Bt cotton in India

Gujar

Kalia

Kumari

et al. 2007

Journal of Invertebrate Pathology

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Section: Bt Resistance Management For H Armigera In Cottonmentioning

confidence: 99%

Helicoverpa armigera baseline susceptibility to Bacillus thuringiensis Cry toxins and resistance management for Bt cotton in India

Gujar

Kalia

Kumari

et al. 2007

Journal of Invertebrate Pathology

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“…With the broad host use of many lepidopteran crop pests such as heliothines and other noctuids such as Spodoptera spp., alternative host contributions should be given more consideration in future modeling of insect resistance. Alternative host contributions have been shown to be particularly important in the population dynamics of cotton pests such as H. armigera in countries with diverse cropping patterns such as China (Wu et al 2002) and India (Ravi et al 2005). However, the data of Gould et al (2002) indicate that this also can be true of similar pests in areas having much more homogeneous cropping patterns, as in the U.S. cotton belt.…”

Section: Resultsmentioning

confidence: 99%

Modeling the Impact of Alternative Hosts on Helicoverpa zea Adaptation to Bollgard Cotton

Gustafson¹,

Head²,

Caprio³

2006

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For highly polyphagous cotton, Gossypium hirsutum L., pests such as Helicoverpa zea (Boddie), a substantial portion of the larval population develops on noncotton alternative hosts. These noncotton hosts potentially provide a natural refuge for H. zea, thereby slowing the evolution of resistance to the Bacillus thuringiensis Berliner (Bt)-derived Cry1Ac protein present in Bollgard cotton. Here, we demonstrate how the measured contribution of such alternative hosts can be included in estimating the "effective refuge" present for H. zea and in modeling resistance evolution in this species. A single-gene, two-compartment model was used in which one compartment represented corn, Zea mays L., and cotton that express the Cry1Ac protein or similar proteins, and the other compartment was the effective refuge, made up of a weighted average of non-Bt cotton and noncotton hosts. The effective refuge was estimated for each of six generations of H. zea based upon available data on larval population densities on different hosts and cropping patterns. Model runs were performed for regions centered on three states: Georgia, Mississippi, and North Carolina. Three sets of fitness cost assumptions for the putative resistance gene were used: none, low, and moderate, with either recessive or additive inheritance for resistance and fitness costs. For Georgia and North Carolina, resistance was predicted to take >30 yr to evolve except in the absence of fitness costs. For Mississippi, results were sensitive to fitness costs: >30 yr with moderate costs, 7-14 yr with low costs, and 6-10 yr without such costs.

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“…Alternative non-transgenic hosts viz. pigeon pea, tomato, okra, sorghum, sunflower and chickpea of H. armigera, which serve as important sources of refuges (Ravi et al, 2005), are considered adequate instead of structured refuge in the country. The two key assumptions of the refuge strategy are that inheritance of resistance is recessive and random mating occurs between the susceptible and resistant strains.…”

Section: Discussionmentioning

confidence: 99%

Inheritance of Cry1Ac resistance and associated biological traits in the cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae)

Nair

Kalia

Aggarwal

et al. 2010

Journal of Invertebrate Pathology

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Relative Abundance ofHelicoverpa armigera(Lepidoptera: Noctuidae) on Different Host Crops in India and the Role of These Crops as Natural Refuge forBacillus thuringiensisCotton

Cited by 60 publications

References 18 publications

Helicoverpa armigera baseline susceptibility to Bacillus thuringiensis Cry toxins and resistance management for Bt cotton in India

Helicoverpa armigera baseline susceptibility to Bacillus thuringiensis Cry toxins and resistance management for Bt cotton in India

Modeling the Impact of Alternative Hosts on <I>Helicoverpa zea</I> Adaptation to Bollgard Cotton

Inheritance of Cry1Ac resistance and associated biological traits in the cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae)

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