SCREENING OF CHEMICAL COMPOUNDS FOR SLOWACTING TOXICANT CHARACTERISTICS AGAINST SUBTERRANEAN TERMITES
Keywords:
Heterotermes indicola, molybdophosphoric acid, zinc sulphate, lead acetate, cadmium chloride and ELT90Abstract
Different compounds viz. boric acid, sodium arsenate, mercuric iodide, molybdophosphoric acid, zincsulphate, lead acetate and cadmium chloride at 6 different concentration levels, i.e. 0.005, 0.05, 0.1,0.2, 0.25, and 0.5% prepared in distilled water were tested against Heterotermes indicola to screenpotential slow-acting toxicants. Among these compounds molybdophosphoric acid, zinc sulphate, leadacetate, and cadmium chloride showed a low mortality rate that did not exceed 76% even at the highestconcentration (0.5%) used. The second group of boric acid, sodium arsenate and mercuric iodideexhibited ELT90 within 14 days, in at least concentration. Behavioral observations indicated thatamong the 3 compounds in the second group, only boric acid (0.1%) when offered in agar mediumallowed normal tunneling behavior of the termites.
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