Field tests on managing resistance to Bt-engineered plants

Shelton, Anthony M.; Tang, Juliet D.; Roush, Richard T.; Metz, Timothy D.; Earle, Elizabeth D.

doi:10.1038/73804

Cited by 221 publications

(153 citation statements)

References 15 publications

Supporting

Mentioning

137

Contrasting

Unclassified

Order By: Relevance

“…In principle, if resistance is recessive, the heterozygous progeny produced by such matings are killed by the Bt crop, and resistance evolution is greatly delayed. Results from models and short-term, small-scale experiments suggest that refuges can delay resistance substantially (3,(14)(15)(16), but long-term, largescale field tests of the refuge strategy have proved problematic.…”

Section: Bacillus Thuringiensis ͉ Resistance Management ͉ Transgenic mentioning

confidence: 99%

Delayed resistance to transgenic cotton in pink bollworm

Tabashnik

Dennehy

Carrière

2005

Proc. Natl. Acad. Sci. U.S.A.

197

181

View full text Add to dashboard Cite

Transgenic crops producing Bacillus thuringiensis (Bt) toxins kill some key insect pests and thus can reduce reliance on insecticides. Widespread planting of such Bt crops increased concerns that their usefulness would be cut short by rapid evolution of resistance to Bt toxins by pests. Pink bollworm (Pectinophora gossypiella) is a major pest that has experienced intense selection for resistance to Bt cotton in Arizona since 1997. We monitored pink bollworm resistance to Bt toxin for 8 years with laboratory bioassays of strains derived annually from 10 -17 cotton fields statewide. Bioassay results show no net increase from 1997 to 2004 in the mean frequency of pink bollworm resistance to Bt toxin. A synthesis of experimental and modeling results suggests that this delay in resistance can be explained by refuges of cotton without Bt toxin, recessive inheritance of resistance, incomplete resistance, and fitness costs associated with resistance.Bacillus thuringiensis ͉ resistance management ͉ transgenic crops

show abstract

Section: Bacillus Thuringiensis ͉ Resistance Management ͉ Transgenic mentioning

confidence: 99%

Delayed resistance to transgenic cotton in pink bollworm

Tabashnik

Dennehy

Carrière

2005

Proc. Natl. Acad. Sci. U.S.A.

197

181

View full text Add to dashboard Cite

show abstract

“…Together, the high dose and the refuge in this way almost equalize the fitnesses of the R and S alleles so that the R fraction increases only slowly. Mathematical modelling [3,34] has indicated the HDR idea as a good one, and experiments have confirmed that it can work in delaying resistance development [29].…”

Section: Introductionmentioning

confidence: 99%

Boundaries of sustainability in simple and elaborate models of agricultural pest control with a pesticide and a non-toxic refuge

Mohammed-Awel

Ringland

Bantle

et al. 2012

Journal of Biological Dynamics

View full text Add to dashboard Cite

In two models of pest control using a pesticidal crop along with a non-pesticidal refuge to prevent the development of resistance, we numerically compute the bifurcations that bound the region in parameter space where control is sustainable indefinitely. An exact formula for one of the bifurcation surfaces in one of the models is also found. One model is conceptual and as simple as possible. The other is realistic and very detailed. Despite the great differences in the models, we find the same distinctive bifurcation structure. We focus on the parameters that determine: (i) the restriction of pest exchange between the crop and the refuge, which we call 'screening' the refuge, and (ii) the recessiveness of the resistance trait. The screened refuge technique is seen to work in the models up to quite high values of fitness of resistant heterozygotes, that is, even when resistance is not strongly recessive.

show abstract

“…No entanto, a eficiência do controle químico tem sido reduzida em consequência da seleção de populações resistentes, sendo este fato constatado para alguns piretroides e organofosforados (Omoto et al, 2000;Diez-Rodrigues e Omoto, 2001;Cruz et al, 2006). Esta quebra de resistência por parte da lagarta-do-cartucho também pode vir a ocorrer no milho transgênico (Bt), o qual teve sua comercialização aprovada recentemente no Brasil, caso não seja realizado um manejo adequado da cultura (Shelton et al, 2000).…”

Section: Introductionunclassified

Desempenho de cultivares de milho em relação à lagarta-do-cartucho

et al. 2011

View full text Add to dashboard Cite

A constituição genética de cada cultivar de milho é fator preponderante para determinar o nível de dano provocado pela lagarta-do-cartucho, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae); contudo, são escassas as informações sobre o desempenho de diversas cultivares comerciais em relação ao ataque da praga. Objetivou-se, neste trabalho, identificar cultivares de milho menos danificadas pela lagarta-do-cartucho em condições de campo, visando aprimorar o manejo em áreas com histórico de altas infestações da praga e fornecer subsídios para programas de melhoramento genético. O trabalho foi realizado no período da safra de verão, anos agrícolas de 2006/2007 e 2007/2008; e da safrinha, ano agrícola 2007 nos municípios de Capão Bonito (SP), Tatuí (SP) e Coroados (SP). Em cada campo experimental foram realizados dois experimentos, sendo um para híbridos simples e triplos (HST) e outro para híbridos duplos e variedades (HDV). O delineamento experimental foi o de blocos ao acaso, com três e quatro repetições para HST e HDV respectivamente. Avaliou-se a injúria foliar provocada pela lagarta-do-cartucho após infestação natural, com base em escala de notas variando de 1 a 10. Constatou-se diferença significativa entre as cultivares em relação à injúria da lagarta-do-cartucho pelo teste F (P<0,05). Os resultados permitiram concluir que as cultivares DKB 390 (híbrido simples) e DKB 979 (híbrido triplo) são menos danificadas, constituindo germoplasma promissor quanto à resistência à lagarta-do-cartucho.Palavras-chave: Spodoptera frugiperda, Zea mays L., praga, resistência de plantas a insetos. Performance of maize cultivars in relation to fall armyworm AbstractThe genetics of maize cultivars is one of the factors that influence on damage level caused by fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae); however, there is no information about performance of commercial cultivars for this pest attack. The aim of the present research was to identify maize cultivars less damaged by the fall armyworm under field conditions, which could be used as an additional tool for managing the pest in areas with history of high infestations, as well as for genetic breeding programs. The experiments were accomplished during the summer season 2006/2007and 2007 and off-season 2007, in Capão Bonito (SP), Coroados (SP) e Tatuí (SP). Two experiments were set up in each area, one with simple and triple hybrids (HST) and other with double hybrids and varieties (HDV). The experimental design was in randomized blocks, with three and four replications for HST and HDV, respectively. The leaf injury caused by fall armyworm under natural infestation was evaluated using a rating scale ranging from 1 to 10. There were significant differences among cultivars for leaf injury, with the cultivars DKB 390 (simple hybrid) and DKB 979 (triple hybrid) being less damaged. These cultivars may serve as potential sources of resistance against the fall armyworm.

show abstract

Field tests on managing resistance to Bt-engineered plants

Cited by 221 publications

References 15 publications

Delayed resistance to transgenic cotton in pink bollworm

Delayed resistance to transgenic cotton in pink bollworm

Boundaries of sustainability in simple and elaborate models of agricultural pest control with a pesticide and a non-toxic refuge

Desempenho de cultivares de milho em relação à lagarta-do-cartucho

Contact Info

Product

Resources

About