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Laboratory toxicity of the crude extracts of Piper guineense Schum and Thonn, Azadirachta indica A Juss and Parkia clappertoniana to the termites Macrotermes nigeriensis



Laboratory toxicity of the crude extracts of Piper guineense Schum and Thonn, Azadirachta indica A Juss and Parkia clappertoniana to the termites Macrotermes nigeriensis



Insect Science and its Application 14(2): 229-233



Aqueous extracts (5%) of the seeds of Parkia clappertoniana (Jacq), Azadirachta indica A. Juss, and Piper guineense Schum and Thonn caused 90% mortality of the worker caste with P. guineense, and 86% mortality with A. indica and P. clappertoniana respectively within 3 hr of topical application. At 24 hr, mortality of Macrotermes nigeriensis (Sjostedti) workers was 100% with the same concentration of each extract. Oral toxicity at 3 hr to the worker caste using cuttings of cassava, Manihot esculenta Crantz impregnated with each extract gave 65% mortality with Piper, and 45 and 29% with Azadirachta and Parkia, respectively. Mortality by oral toxicity reached 100% in 12 hr with Piper, 95 and 69%, respectively with Azadirachta and Parkia. Increasing the concentrations of each extract to 15% did not significantly (P gt 0.05) increase the toxicities of the extracts to the worker caste even at prolonged exposure periods.

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