Browsing by Author "Aidoo, I.E."
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Item Biological Effects of Neem Oil and Neemazal against the Larger Grain Borer, Prostephanus Truncatus (Horn) (Coleoptera: Bostrichidae) on Stored Maize(University of Ghana, 2001-07) Aidoo, I.E.; Obeng-Ofori, D.; Akuamoah, R.K.; Cudjoe, A.R.; University of Ghana, College of Basic and Applied Sciences, School of Biological Sciences, Department of Animal Biology and Conservation Science (DABCS)The biological activity of neem oil and neemazal against the larger grain borer, Prostephanus truncatus (Horn) was assessed in maize grain in the laboratory. The bioassays carried out were toxicity of the products against adults and immature stages, effect of the products on progeny production, damage assessment, repellent action and persistency of the products in grain and their effect on seed viability. Neemazal was highly toxic to P. truncatus than neem oil. The highest dosage of 0.8 ml killed 100 % adults of P. truncatus after 72 h exposure but the same dosage of neem oil evoked 70 % mortality after 96 h. The products were also active against the eggs and larvae causing a significant mortality. Neemazal provided greatest protection of maize grains with no noticeable feeding holes on grains treated with 0.6 and 0.8 ml/gm. Both products were moderately repellent to P. truncatus causing less than 50 % repellency. Activity of the two products significantly declined in treated grain after 24 h of storage following treatment. Neem oil and neemazal increased water absorption by maize seeds. Furthermore, seed germination was not affected by neem oil but neemazal significantly reduced seed germination. For the control of P. truncatus in stored maize, neemazal offers greatest protection against both the immature stages and adults. The non-toxicity of neem products to man and other beneficial organisms emphasize the potential use of these products as protectants of farm gate grain storage of small holdings in rural communities in Ghana and other parts of Africa where the neem is abundant.Item Efficacy of Neem oil and Neemazal against the Larger Grain Borer, Prostephanus truncatus (Horn) in stored maize(Journal of Ghana Science Association, 2009) Boateng, B.A.; Aidoo, I.E.; Obeng-Ofori, D.; Cudjoe, A.R.; Akuamoah, R.K.The biological activity of neem oil and Neemazalon adult and immature stages of the larger grain borer, Prostephanus truncatus, as well as on its F1 progeny was assessed in stored maize in the laboratory. Repellency and persistency effects of the treatments in grain as well as the effect of the treatments on grain damage were also determined. Neemazal was more toxicto P. truncatus than neem oil. The highest dosage of 0.8ml/200g grain killed 100% adult P. maculatus after 72 h exposure but the same dosage of neem oil resulted in 70% mortality after 96h. The products also caused significant (p<0.05) mortality in P. truncates eggs and larvae, Neemazal provided greater protection to maize grains with no noticeable boreholes on grains' treatedwith 0.6 and 0.8ml/200g grain. All treatments repelled less that 50% P. truncatus adults. Activity of the two product significantly declined (0<0.05) in treated grain after 24 hour of storage following treatment. Neemaza loffered greater protection against both immature stages and adults of P. truncatusin stored maize.