scholarly journals CROSS RESISTANCE OF DIPEL 2x RESISTANT STRAIN OF PINK BOLLWORM PECTINOPHORA GOSSYPIELLA (SAUND.) TO SOME CONVENTIONAL AND BIOINSECTICIDES

2006 ◽  
Vol 14 (2) ◽  
pp. 823-833
Author(s):  
El-Zemaity M.S. ◽  
A.E. Bayoumi ◽  
Mona F. Rofail ◽  
Hemat Z. Moustafa
Keyword(s):  
Resistant Strain ◽  
Pink Bollworm ◽  
Pectinophora Gossypiella ◽  
Cross Resistance ◽  
Dipel 2X

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.

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.

scholarly journals Identification of oviposition deterrents from pink bollworm, Pectinophora gossypiella(Saunders)

2020 ◽  
Vol 41 (3) ◽  
pp. 644-649
Author(s):  
V. Shah ◽  
◽  
R. Pande ◽  
P. Verma ◽  
N. Gokte-Narkhedkar ◽  
...  
Keyword(s):  
Pink Bollworm ◽  
Pectinophora Gossypiella ◽  
Oviposition Deterrents
Sign in / Sign up

Export Citation Format

Share Document