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Susceptibility pattern and development of resistance in the diamondback moth, Plutella xylostella L, to Bacillus thuringiensis Berl var kurstaki in India
Author(s) -
Mohan Muthugounder,
Gujar Govind T
Publication year - 2000
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/(sici)1526-4998(200002)56:2<189::aid-ps95>3.0.co;2-t
Subject(s) - plutella , diamondback moth , bacillus thuringiensis , biology , pest analysis , bioassay , larva , plutellidae , toxicology , insecticide resistance , horticulture , botany , ecology , bacteria , genetics
Base‐line susceptibility for six‐day‐old larvae of the diamondback moth, Plutella xylostella , against Bacillus thuringiensis var kurstaki (Biobit ® ) was studied by a cabbage leaf disc dip bioassay technique. Diamondback moth from 13 locations in seven different states spread over a distance of about 3000 km longitudinally was used for these studies. Forty‐eight‐hour LC 50 values varied from 1.0 to 10.97 mg AI litre −1 . Further investigations on the development of resistance under laboratory conditions showed an increase in LC 50 from 2.76 (for unselected F 1 generation) to 5.28 mg AI litre −1 (for selected F 9 generation), using a selection concentration of 6.4 mg AI litre −1 . This suggested a possibility of the development of resistance under field conditions if there were to be extensive and indiscriminate use of B thuringiensis . These findings are discussed in relation to integrated pest management and the mechanisms of resistance in resistance management tactics. © 2000 Society of Chemical Industry