Effects of Entomopathogenic Nematodes on Evolution of Pink Bollworm Resistance to Bacillus thuringiensis Toxin Cry1Ac

2012 ◽  
Vol 105 (3) ◽  
pp. 994-1005 ◽  
Author(s):  
Aaron J. Gassmann ◽  
Eugene R. Hannon ◽  
Mark S. Sisterson ◽  
S. Patricia Stock ◽  
Yves Carrière ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Entomopathogenic Nematodes ◽  
Pink Bollworm

scholarly journals Effects of Pink Bollworm Resistance to Bacillus thuringiensis on Phenoloxidase Activity and Susceptibility to Entomopathogenic Nematodes

2009 ◽  
Vol 102 (3) ◽  
pp. 1224-1232 ◽  
Author(s):  
Aaron J. Gassmann ◽  
Jeffrey A. Fabrick ◽  
Mark S. Sisterson ◽  
Eugene R. Hannon ◽  
S. Patricia Stock ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Entomopathogenic Nematodes ◽  
Pink Bollworm ◽  
Phenoloxidase Activity

High-Level Resistance to Bacillus thuringiensis Toxin Cry1Ac and Cadherin Genotype in Pink Bollworm

2006 ◽  
Vol 99 (6) ◽  
pp. 2125-2131 ◽  
Author(s):  
Bruce E. Tabashnik ◽  
Robert W. Biggs ◽  
Jeffrey A. Fabrick ◽  
Aaron J. Gassmann ◽  
Timothy J. Dennehy ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Pink Bollworm ◽  
Bacillus Thuringiensis Toxin ◽  
High Level ◽  
Level Resistance

scholarly journals Control of Resistant Pink Bollworm (Pectinophora gossypiella) by Transgenic Cotton That Produces Bacillus thuringiensis Toxin Cry2Ab

2002 ◽  
Vol 68 (8) ◽  
pp. 3790-3794 ◽  
Author(s):  
Bruce E. Tabashnik ◽  
Timothy J. Dennehy ◽  
Maria A. Sims ◽  
Karen Larkin ◽  
Graham P. Head ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
First Generation ◽  
Second Generation ◽  
Transgenic Cotton ◽  
Larval Survival ◽  
Genetically Engineered ◽  
Pink Bollworm ◽  
Pectinophora Gossypiella ◽  
Cross Resistance ◽  
Average Survival

ABSTRACT Crops genetically engineered to produce Bacillus thuringiensis toxins for insect control can reduce use of conventional insecticides, but insect resistance could limit the success of this technology. The first generation of transgenic cotton with B. thuringiensis produces a single toxin, Cry1Ac, that is highly effective against susceptible larvae of pink bollworm (Pectinophora gossypiella), a major cotton pest. To counter potential problems with resistance, second-generation transgenic cotton that produces B. thuringiensis toxin Cry2Ab alone or in combination with Cry1Ac has been developed. In greenhouse bioassays, a pink bollworm strain selected in the laboratory for resistance to Cry1Ac survived equally well on transgenic cotton with Cry1Ac and on cotton without Cry1Ac. In contrast, Cry1Ac-resistant pink bollworm had little or no survival on second-generation transgenic cotton with Cry2Ab alone or with Cry1Ac plus Cry2Ab. Artificial diet bioassays showed that resistance to Cry1Ac did not confer strong cross-resistance to Cry2Aa. Strains with >90% larval survival on diet with 10 μg of Cry1Ac per ml showed 0% survival on diet with 3.2 or 10 μg of Cry2Aa per ml. However, the average survival of larvae fed a diet with 1 μg of Cry2Aa per ml was higher for Cry1Ac-resistant strains (2 to 10%) than for susceptible strains (0%). If plants with Cry1Ac plus Cry2Ab are deployed while genes that confer resistance to each of these toxins are rare, and if the inheritance of resistance to both toxins is recessive, the efficacy of transgenic cotton might be greatly extended.

CONTROL OF SPRUCE BUDMOTH, ZEIRAPHERA CANADENSIS MUT. AND FREE., IN WHITE SPRUCE PLANTATIONS WITH ENTOMOPATHOGENIC NEMATODES, STEINERNEMA SPP.

1991 ◽  
Vol 123 (2) ◽  
pp. 379-385 ◽  
Author(s):  
D.C. Eidt ◽  
Gary B. Dunphy
Keyword(s):  
Bacillus Thuringiensis ◽  
Entomopathogenic Nematodes ◽  
Foliar Spray ◽  
White Spruce ◽  
Steinernema Carpocapsae ◽  
Infective Juvenile ◽  
Soil Drench ◽  
Population Reduction

AbstractA spruce budmoth population reduction of 82%, as measured by moth emergence, was realized after a foliar spray in which Futura®, a commercial Bacillus thuringiensis Berliner (B.t.) formulation, was added to a suspension of Steinernema carpocapsae (Weiser). The nematode suspension, which took advantage of the wetting and spreading agents in the formulation, was applied to runoff at the rate of 9785 viable infective juvenile nematodes per litre. Mortality was attributed to the nematodes; B.t. was not available to the cryptic larvae. Soil drench treatments were encouraging, and suggested that applications of nematodes to the soil may be feasible.

scholarly journals Effect of Resistance to Bacillus thuringiensis Cotton on Pink Bollworm (Lepidoptera: Gelechiidae) Response to Sex Pheromone

2006 ◽  
Vol 99 (3) ◽  
pp. 946-953
Author(s):  
Yves Carrière ◽  
Megan E. Nyboer ◽  
Christa Ellers-Kirk ◽  
James Sollome ◽  
Nick Colletto ◽  
...  
Keyword(s):  
Sex Pheromone ◽  
Bacillus Thuringiensis ◽  
Pink Bollworm

Effects of Four Nematode Species on Fitness Costs of Pink Bollworm Resistance to Bacillus thuringiensis Toxin Cry1Ac

2010 ◽  
Vol 103 (5) ◽  
pp. 1821-1831 ◽  
Author(s):  
Eugene R. Hannon ◽  
Mark S. Sisterson ◽  
S. Patricia Stock ◽  
Yves Carrière ◽  
Bruce E. Tabashnik ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Nematode Species ◽  
Pink Bollworm ◽  
Fitness Costs ◽  
Bacillus Thuringiensis Toxin

Effect of Resistance to Bacillus thuringiensis Cotton on Pink Bollworm (Lepidoptera: Gelechiidae) Response to Sex Pheromone

2006 ◽  
Vol 99 (3) ◽  
pp. 946-953 ◽  
Author(s):  
Yves Carrière ◽  
Megan E. Nyboer ◽  
Christa Ellers-Kirk ◽  
James Sollome ◽  
Nick Colletto ◽  
...  
Keyword(s):  
Sex Pheromone ◽  
Bacillus Thuringiensis ◽  
Pink Bollworm

Cadherin-Based Resistance to Bacillus thuringiensis Cotton in Hybrid Strains of Pink Bollworm: Fitness Costs and Incomplete Resistance

2006 ◽  
Vol 99 (6) ◽  
pp. 1925-1935 ◽  
Author(s):  
Yves Carrière ◽  
Christa Ellers-Kirk ◽  
Robert W. Biggs ◽  
Megan E. Nyboer ◽  
Gopalan C. Unnithan ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Pink Bollworm ◽  
Fitness Costs ◽  
Incomplete Resistance

scholarly journals Cross-Resistance of Pink Bollworm (Pectinophora gossypiella) to Bacillus thuringiensis Toxins

2000 ◽  
Vol 66 (10) ◽  
pp. 4582-4584 ◽  
Author(s):  
Bruce E. Tabashnik ◽  
Yong-Biao Liu ◽  
Ruud A. de Maagd ◽  
Timothy J. Dennehy
Keyword(s):  
Bacillus Thuringiensis ◽  
Pink Bollworm ◽  
Pectinophora Gossypiella ◽  
Cross Resistance ◽  
Mechanism Of Resistance ◽  
Narrow Spectrum ◽  
Target Sites ◽  
The Cross

ABSTRACT Two strains of pink bollworm (Pectinophora gossypiella) selected in the laboratory for resistance to Bacillus thuringiensis toxin Cry1Ac had substantial cross-resistance to Cry1Aa and Cry1Ab but not to Cry1Bb, Cry1Ca, Cry1Da, Cry1Ea, Cry1Ja, Cry2Aa, Cry9Ca, H04, or H205. The narrow spectrum of resistance and the cross-resistance to activated toxin Cry1Ab suggest that reduced binding of toxin to midgut target sites could be an important mechanism of resistance.

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