EVALUATION ON THE TOXICITY EFFECT OF FOUR <em>BACILLUS</em> <em>THURINGIENSIS</em> STRAINS AGAINST THE TEAK SKELETONISER, <em>PALIGA</em> <em>DAMASTESALIS</em> WALKER (LEPIDOPTERA: PYRALOIDEA: CRAMBIDAE)

Abstract

Four Bacillus thuringiensis (Bt) strains, namely HD-1, Florbac, SN-2 (Bt subspecies aizawai strain) and SN-5, were screened against the 3rd instar of the teak skeletoniser, Paliga damastesalis. A total of 750 larvae were tested in the laboratory at 25 + 1 °C. Mortality after 24, 48 and 72 h exposure was analysed using logistic regression. Bt subspecies aizawai (strain SN-2) was found to be the most effective in controlling the teak skeletoniser larvae.