Entomology and
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Efficacy of Leaf Powders of Senna obtusifolia (L.) and Mitracarpus hirtus (L.) DC. on the Survival of Sitophilus zeamais Motschulsky [Coleoptera: Curculionidae] on Sorghum Grains During Storage

Suleiman M., Suleiman F. L.
Abstract

Experiments were conducted in the Biology Laboratory 1 of the Department of Biology of Umaru Musa Yar’adua University (UMYU), Katsina to test the insecticidal effects of leaf powders of Senna obtusifolia (L.) and Mitracarpus hirtus (L.) DC. Doses of 1.0, 2.0 3.0g of each of the leaf powders and 1.0g of Pestox® (cypermethrin) were applied to 50g each of sorghum grains in which five pairs of adult Sitophilus zeamais Motschulsky were released for adult mortality, emergence and grain damage tests. The results showed that the highest (36.67%) mortality of S. zeamais obtained when 3.0g of S. obtusifolia was applied while the least (10.00%) was recorded from the treatments of 1.0g M. hirtus. The findings of this study also showed that adult mortality of S. zeamais was directly proportional to the amounts of the leaf powders applied. The results also revealed that from the highest (114.33) adult emergence of the weevils was obtained when 1.0g of M. hirtus was applied, while the least (40.67) was recorded from the treatment of 3.0g S. obtusifolia. The findings of this study showed that the adult emergence of S. zeamais was inversely proportional to the amounts of the leaf powders applied. Generally, the efficacy of the leaf powders on the survival of S. zeamais was found to be significantly (p<0.05) different between the test powders and the control. Findings of this study showed that the leaf powders of S. obtusifolia and M. hirtus were effective in protecting sorghum grains against S. zeamais infestation in stores. Therefore, more research is recommended on toxicity effect of these plant powders on other insect pests.

Key words: Leaf powders, M. hirtus, Sorghum grains, Survival, S. obtusifolia, S. zeamais

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Entomology and Applied Science Letters is an international double-blind peer reviewed publication which publishes scientific research & review articles related to insects that contain information of interest to a wider audience, e.g. papers bearing on the theoretical, genetic, agricultural, medical and biodiversity issues. Emphasis is also placed on the selection of comprehensive, revisionary or integrated systematics studies of broader biological or zoogeographical relevance. In addition to full-length research articles and reviews, the journal publishes interpretive articles in a Forum section, Short Communications, and Letters to the Editor. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.

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Entomology and Applied Science Letters supports the submission of entomological papers that contain information of interest to a wider reader groups e. g. papers bearing on taxonomy, phylogeny, biodiversity, ecology, systematic, agriculture, morphology. The selection of comprehensive, revisionary or integrated systematics studies of broader biological or zoogeographical relevance is also important. Distinguished entomologists drawn from different parts of the world serve as honorary members of the Editorial Board. The journal encompasses all the varied aspects of entomological research.