Toxicity of microbial insecticide bacillus thuringiensis Berliner vars kurstaki and aizawai to the larvae of Spodoptera litura Fabr. at different instars

Issue Date

10-2004

Abstract

The life cycle of the cutworm, Spodoptera litura (Lepidoptera: Noctuidae), an important pest of many agricultural crops, was studied on castor leaves to ascertain the number and duration of larval instars prior to bioassay using Bacillus thuringiensis var kurstaki and aizawai on the different instars. Two-day-old second, one day-old third, and one-day-old fourth instar larvae of uniform sizes were used in the toxicity tests. Bt aizawa was more toxic than Bt kurstaki to the second, third and fourth instar S. litura, all the test larvae had comparable reactions to Bt aizawa, toxic both in the leaf dipping and droplet feeding tests. Both Bt varieties have good potential for use in the management of S. litura on different agricultural crops.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

18

Issue

2

Page

178

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

SPODOPTERA LITURA; BACILLUS THURINGIENSIS; INSTARS; LIFE CYCLE; PEST MANAGEMENT; PEST CONTROL

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