BIOEFFICACY OF Bacillus thuringiensis ISOLATES AGAINST SPOTTED POD BORER, Maruca testulalis (Geyer.) ON COWPEA (Vigna unguiculata L.)
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Date
2004
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AAU, Anand
Abstract
Studies on bioefficacy of native Bacillus thuringiensis (Berliner) isolates (TOM-1, TOB-I and CT-2) in laboratory, pot as well as field conditions against Maruca testulalis (Geyer) on cowpea variety pusa falguni were carried out at Gujarat Agriculture University, Anand campus during Kharif 2002 and 2003. Bioassay study of B. thuringiensis isolates (TOM-1, TOB-1 and CT-2) against M. testulalis indicated that significant larval mortality was started after 48 hrs. of application and it was increase with increased in concentration and exposure period. The isolate B.T. TOM-1 gave highest larval mortality (83.33 %) at 144 hrs. followed by B.t. CT-2 and B.t. TOB-1 which exhibited highest mortality (80.00% and 76.67%) respectively,after 144 hrs. at 10 to power 9 spore crystal mixture/ ml. Thus the bioassay of three native isolates showed substantial efficacy and scope for effective suppression of M testulalis.
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AGRICULTURAL ENTOMOLOGY, AGRICULTURE, A STUDY