Pest Management Science (2000) 56, 189-194

Muthugounder Mohan and Govind T. Gujar (2000)
Susceptibility pattern and development of resistance in the diamondback moth, Plutella xylostella L, to Bacillus thuringiensis Berl var kurstaki in India
Pest Management Science 56 (2), 189-194
Abstract: 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 LC₅₀ 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 LC₅₀ from 2.76 (for unselected F₁ generation) to 5.28 mg AI litre^-1 (for selected F₉ 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.
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Database assignments for author(s): Muthugounder Mohan, Govind T. Gujar

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plutella xylostella	Cabbage (Brassica oleracea)	India
Bacillus thuringiensis var. kurstaki (entomopathogen)	Plutella xylostella		India