Informatics Publishing Limited

P. M. Ganapathy , M. Rangarajan

Abstract

A general account of the Andaman Forests, their compositional characteristics and response in physiological behaviour to climatic factors are given as prologue to the study of phenology and behaviour in nursery of the important timber species of the Islands. Existing knowledge of phenology of these important species and their response to artificial propagation is either scanty, diffuse or totally unavailable. This study is a summation of available information on the subject supplemented to a large extent by original observations in ptots laid out to statistical conformity. The information contained is hoped to be useful to those especially of mainland forest departments who are keen to introduce Andaman species in their respective zones. To foresters of these islands the data presented are of little value as most of the species respond more favourably to carefully phased natural regeneration operations.

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C. Gailce Leo Justin ¹, R. J. Rabindra ¹, S. Jayaraj ¹, M. Rangarajan ²

Affiliations
1 Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 Tamil Nadu Agricultural University, Coimbatore 641 003, IN

Abstract

Laboratory bioassay tests on the comparative efficacy of eight Bacillus thuringiensis (B.t.) subspecies against third instar larvae of Plutella xylostella L. as well as its safety to second lnstar larvae of Bombyx mori L. revealed that B.t. subsp. kurstaki (Bactospeine) was the most toxic to larvae of P. xylostella followed by B.t. subsp. thuringiensis and B.t. subsp. kurstaki (lab culture). The B.t.t. and B.t.k. (Bactospeine) were found to be less toxic to the larvae of Bombyx mori than the other species.

Keywords

Bacillus thuringiensis, Subspecies, Toxicity, Plutella xylostella, Bombyx mori.

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