Out
of 218 Bacillus thuringiensis strains, one strain belonging to serotype
H14 (VCRC B17) isolated from soil sample collected in Pondicherry was
found to be extremely toxic to mosquito larvae.
The spore-toxin complex of Bti was used as the
active ingredient and two formulations, a WDP (40%) and a controlled
release formulation (CRF) were developed.
The WDP at 2.5-5 kg/ha for clear and 5-15 kg/ha
for polluted habitats was found to have residual activity for about a
week against Culex quinquefasciatus.
The CRF at 10 kg(ai)/ha was found to have a residual activity for 15 weeks in disused wells against Cx. quinquefasciatus.
The technology has been licensed to M/s Tuticorin Alikali Chemicals,
Chennai.
Out of 152 isolates of B.
sphaericus, one isolate (Acc. No. VCRC B42) has been given 5 star
ranking based on its toxicity to mosquito larvae by the WHO
collaborating reference centre, Pasteur Institute, Paris, France.
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