Evaluating Resistance Management Strategies for Multiple Toxins in the Presence of External Refuges

Caprio, Michael A.

doi:10.1093/jee/91.5.1021

Cited by 118 publications

(78 citation statements)

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“…An underlying assumption of this study was that no cross-resistance existed between the two hypothetical or the two real resistance genes (case study). It is generally believed that cross-resistance will lead to faster evolution of resistance and shorter time to control failures in the Þeld (Caprio 1998). In the case study, rarer resistance genes conferring much greater survival to each toxin were not included along with the two "real" genes.…”

Section: Discussionmentioning

confidence: 99%

Modeling Evolution of <I>Diabrotica virgifera virgifera</I> (Coleoptera: Chrysomelidae) to Transgenic Corn With Two Insecticidal Traits

Onstad¹,

Meinke²

2010

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Section: Discussionmentioning

confidence: 99%

Modeling Evolution of <I>Diabrotica virgifera virgifera</I> (Coleoptera: Chrysomelidae) to Transgenic Corn With Two Insecticidal Traits

Onstad¹,

Meinke²

2010

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“…Earlier work demonstrated that Bt cotton could control about 80-95 per cent pests on average in the Yellow River Valley (Wu, 2002;Li et al, 2004). Based on these studies (from China) and empirical studies in the United States (Caprio, 1998;Burd et al, 2001;Storer et al, 2003;Livingston et al, 2004), we assume that the mortality rate of pests with double susceptible genes to Bt toxin is 0.90 in Bt cotton fields. As assumed in Livingston et al (2004Livingston et al ( , 2002, we also assume that the mortality rate of pests with double resistant genes to Bt toxin, the so-called 'fitness cost', is 0.05.…”

Section: Biological Parametersmentioning

confidence: 99%

Dynamically optimal strategies for managing the joint resistance of pests to Bt toxin and conventional pesticides in a developing country

Qiao

Wilen

Huang

et al. 2009

European Review of Agricultural Economics

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In this study we discuss why planting non-Bacillus thuringiensis (non-Bt) cotton as a refuge crop in China (and other developing countries) may not be economically optimal. To show this, we develop a bioeconomic model to run simulations that will help find the optimal strategies for managing the joint resistance of pests to the Bt toxin and conventional pesticides. We show that the approach of not requiring non-Bt cotton as a refuge is defensible given initial conditions and parameters calibrated to China's cotton production environment. Of special importance is the existence of natural refuge crops. The nature of transaction costs associated with implementing a refuge policy is also considered.

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“…Another potential IRM strategy is pyramiding two or more conventional chemical insecticides (Curtis 1985, Mani 1985. Models predict delays in resistance evolution when two or more insecticides are pyramided compared with sequential use, but this is dependent on a number of factors including low initial resistance allele frequency, high proportion mortality caused by both insecticides, adequate refuges, lack of cross-resistance between the two insecticides, and recessive inheritance of resistance for both toxins (Curtis 1985, Mani 1985, Tabashnik 1989, Caprio 1998.…”

mentioning

confidence: 99%

Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management

et al. 2013

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A 2-yr field experiment was conducted to determine the effects on Diabrotica spp. (Coleoptera: Chrysomelidae) of an insecticidal seed treatment (Poncho 1250, (AI) /clothianidin) and a granular insecticide (Aztec 2.1G, (AI)/tebupirimphos and cyfluthrin) alone and in combination with maize producing the insectidical toxin Cry3Bb1 derived from the bacterium Bacillus thuringiensis (Bt). Yields for Bt maize plots were significantly greater than for non-Bt maize; however, insecticides did not significantly affect yield. Insecticides significantly decreased root injury in non-Bt maize plots, but there were no significant differences in root injury between Bt maize with or without either insecticide. Maize producing the Bt toxin Cry3Bb1 and the soil-applied insecticide Aztec significantly decreased survival of western corn rootworm (Diabrotica virgifera virgifera LeConte), while only Bt maize significantly decreased survival of the northern corn rootworm (Diabrotica barberi Smith & Lawrence). For both species, Bt maize and each of the insecticides delayed emergence. In the absence of density-dependent mortality, Bt maize imposed 71 and 80% reduction in survival on the western corn rootworm and the northern corn rootworm, respectively. The data from this study do not support combining insecticide with Bt maize because the addition of insecticide did not increase yield or reduce root injury for Bt maize, and the level of rootworm mortality achieved with conventional insecticide was likely too low to delay the evolution of Bt resistance. In addition, delays in emergence from Bt maize combined with insecticides could promote assortative mating among Bt-selected individuals, which may hasten resistance evolution. RightsThis article is the copyright property of the Entomological Society of America and may not be used for any commercial or other private purpose without specific permission of the Entomological Society of America.This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ent_pubs/175BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. ABSTRACT A 2-yr Þeld experiment was conducted to determine the effects on Diabrotica spp. Effect of Bt(Coleoptera: Chrysomelidae) of an insecticidal seed treatment (Poncho 1250, (AI)/clothianidin) and a granular insecticide (Aztec 2.1G, (AI)/tebupirimphos and cyßuthrin) alone and in combination with maize producing the insectidical toxin Cry3Bb1 derived from the bacterium Bacillus thuringiensis (Bt). Yields for Bt maize plots were signiÞcantly greater than for non-Bt maize; however, insecticides did not signiÞcantly affect yield. Insecticides signiÞcantly decreased root injury in non-Bt maize plots, but there were no signiÞcant differences in root injury between Bt maize with or without either insecticide. Maize producing the Bt toxin Cr...

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Evaluating Resistance Management Strategies for Multiple Toxins in the Presence of External Refuges

Cited by 118 publications

References 0 publications

Modeling Evolution of <I>Diabrotica virgifera virgifera</I> (Coleoptera: Chrysomelidae) to Transgenic Corn With Two Insecticidal Traits

Modeling Evolution of <I>Diabrotica virgifera virgifera</I> (Coleoptera: Chrysomelidae) to Transgenic Corn With Two Insecticidal Traits

Dynamically optimal strategies for managing the joint resistance of pests to Bt toxin and conventional pesticides in a developing country

Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management

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