Study on the of Bacillus thuringiensis israelensis (VectoBac WDG) for vector control in Chumphon Province

Abstract

Efficacy of compounds microbial Bacillus thuringiensis israelensis (Bti) has been developed in the form of water dispersible granule called as VectoBac WDG for trade name to control Aedes mosquito resting in the house of slum area within municipality. VectoBac WDG has been used one gram per 200 liters of water by entering into 100 water containers.
Ae. aegypti larvae and pupae were observed every two weeks up to four weeks and found that Ae. aegypti larvae and pupae were dropped 95% when compare to the number of mosquito larvae and pupae before using microbial Bti. Moreover, this study has been used to control Anopheles mosquito in the area where malaria transmission was high and classified as perennial transmission area (A1) in Tha Sae District, Chumphon Province by spraying microbial Bti
in the main common stream where Anopheles larvae were mostly found. VectoBac WDG has been used 800 grams per 10,000 square metres (or 6.25 rai) with an Ultra Low Volume spray­ing model Stihl SR 420 sprayed for two rounds in every two weeks into the stream.
Anopheles larvae and pupae survey was conducted in every two weeks until eight weeks indicated that the number of Anopheles larvae and pupae decreased 99%. The efficacy of microbial Bti could be an effective vector control measure for Anopheles larvae within 7-8 weeks.