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Insecticidal toxicity of two bruchid-resistant cowpea cultivar powders as cowpea seed protectants against Callosobruchus maculatus(Fab.)(Coleoptera:Chrysomelidae)

引用

Food Quality and Safety 2019年第1期3卷 35-39页

作者： kayode D.Ileke Department of Biology School of ScienceFederal University of TechnologyOndo StateNigeria

Toxicity of bruchid-resistant cultivars mit04k-399-1 and mit07k-299-92 powders as cowpea protectants against Callosobruchus maculatus(Fab.)was investigated at an ambient temperature of 28±2°C and a relative humidity of 75±5%.Their efficacy was tested at dosage,0.5,1.0,1.5,2.0,2.5,and 3.0 g/20 g of cowpea seeds on adult mortality,oviposition,adult emergence,progeny development,seed damage,weight loss,and Beetle Perforation Index(BPI)by cowpea *** result showed that toxicity of the bruchid-resistant cowpea cultivar powders on adult bruchid is dosage-and *** a dosage of 3.0 g/20 g,cultivars mit04k-399-1 and mit07k-299-92 powders achieved 70%and 72.5%lethal effect on adult *** after 4 days of treatment,*** and percentage adult emergence of *** decrease with an increase in powder ***,reduction in progeny development of *** increases with an increase in powder *** mean number of adult emergence decreased at 2 g/20 g,2.5 g/20 g and 3 g/20 *** mit04k-399-1 and mit07k-299-92 powders significantly affected egg *** mit07k-299-92 powder was more effective against oviposition and adult emergence at higher concentrations than mit04k-399-1 powder,an effect that was not significantly different(P>0.05)from each *** BPI of 9.1 and 6.2 was recorded on cowpea seeds treated with mit04k-399-1 and mit07k-299-92 powders at a dosage of 3 g/20 g,*** fear of residual toxicity on nontargeted organisms is not associated with the use of resistant cowpea cultivars as seed *** farmers are familiar with the technology involved in the preparation and application of powders as *** of bruchid-resistant cowpea cultivars mit04k-399-1 and mit07k-299-92 powders into the management of coleopteran pests will ensure availability of viable seeds for future farming in developing nations such as Nigeria.

关键词： bruchid resistant cultivar mit04k-399-1 cultivar mit07k-299-92 Callosobruchus maculatus Vignia unguiculata

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