Further investigation of the insecticidal activity of black pepper (Piper nigrum L.) and red pepper (Capsicum annum L.) on major storage insect pests of corn and legume [cowpea; Philippines]
1983
Ponce de Leon, E.L.
Black pepper was more toxic to the same test insect than the red pepper. Based on mortality test, the order of decreasing toxicity of black pepper to the test insects was: C. chinensis A. obtectus C. cephalonica Ephestia cautella Hubn. Oryzaephi lus surinamensis (L.) Sitophilus zeamais Mosteh Rhizopertha dominica (Fab.) Triboleum castancum Herbst. In the red pepper: C. cephalonica C. chinensis E. cautella O. surinamensis T. castaneum A. obtectus R. dominica S. zeamais. Black pepper and red pepper were more of a stomach poison than a contact poison, and they were residually toxic to the same storage pests, T. castaneum, R. dominica, and O. surinamensis for four and two months respectively. Black and red pepper were also residually toxic to C. chinensis and A. obtectus for 6 months, except the former was residually toxic to A. obtectus for two months only. Both were not residually toxic to the two lepidopterous storage pests, C. cephalonica and E. cautella. The two materials tested had also exhibited growth inhibitory activity in the storage insect pests studied
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