Annals of Plant Protection Sciences
Year : 2002, Volume : 10, Issue : 1
First page : ( 1) Last page : ( 4)
Print ISSN : 0971-3573.

Bioassay and Persistence of Bacillus thuringiensis Berliner Against Plutella xylostella (Linn.) on Cabbage

Pokharkar D.S., Hadapad A.B.*, Puranik T.R.

Department of Agricultural Entomology, M.P.K.V., College of Agriculture, Pune 411 005, india.

* Part of M.Sc. Thesis submitted to MPKV, Rahuri (MS)

Abstract

Studies on different Bacillus thuringiensis formulations against third instar larvae of Plutella xylostella (Linn.) were carried out to determine the LC₅₀ value and their persistence on cabbage leaves under field conditions. The LC₅₀ of the five formulations namely, delfin WG, dipel 8L, halt WP, biobit HPWP and biolep WP ranged between 0.0100 to 0.0173% and the differences were non-significant. All the formulations persisted on the leaves of field grown cabbage plants for at least 120 hrs with the OAR (original activity remaining) ranging from 46.4 to 53.3%. These Bt formulations thus, can provide high protection against DBM for at least five days and can be utilised as critically important component of IPM.

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Key words

Bacillus thuringiensis, Bioassay, Plutella xylostella.

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