Abstract
Storage of common bean and cowpea is limited due to different species of bruchids. Zabrotes subfasciatus and Callosobruchus maculatus are the most important species of bruchids attacking stored common beans and cowpeas, causing yield losses reaching up to 38-100%. Two experiments, one on the effect of different rates of Filter Cake against Z. subfasciatus on common bean, and the other experiment on the effect of different rates of Filter Cake against C. maculatus on cowpea were conducted at Melkassa in 2015, 2016 and 2017. Half liter capacity transparent plastic bags were used for the experiment. About 0-12 h old ten unsexed Z. subfasciatus adults were introduced to common bean seeds. For cowpea experiment, 0-12 h old 10 C. maculatus were used with similar procedures with that of common bean. The experiment was laid out in a Completely Randomized Design. Different crops and insect related data were collected. The results obtained demonstrated that significant differences (P<0.05) were observed among the treated and un treated seeds. The rate of mortality was significantly (P<0.05) higher in all the rates of filter cake when compared to the untreated check 3 days after treatment application. Percent weight loss was nil in all the treatments on common bean and cowpea, while it was above 10% in the untreated check. The germination percentage was not impaired by the treatments. From the current result, it can be concluded that Filter Cake can be used for the control of Z. subfasciatus and C. maculatus. Key words: Callosobruchus maculatus, common bean, cowpea, filter cake, mung bean, Zabrotes subfasciatus.  
Highlights
Common bean (Phaseolus vulgaris L.) and cowpea (Vigna unguiculate) (L.) Walp are among the most important food and cash crops in Eastern and SouthernAfrica (Abate and Ampofo, 1996; Schmale et al, 2002; Aliyu and Wachap, 2014; Bhattarai and Mehlenbacher, 2017; Boukar et al, 2016))
Zabrotes subfasciatus (Boheman) and Callosobruchus maculatus (Fabricius) are the most important species of bruchids attacking stored beans and peas, causing yield losses ranging from 38-100% (Schoonhoven and Cardona, 1986; Adane and Abraham, 1995; Abraham et al, 1994)
No F1 progeny was recorded in all filter cake treatments, but 26 mean F1 progeny was recorded in the untreated check
Summary
Common bean (Phaseolus vulgaris L.) and cowpea (Vigna unguiculate) (L.) Walp are among the most important food and cash crops in Eastern and Southern. Stored beans and peas suffer heavy losses in terms of both quality and quantity mostly by bean bruchids (Negasi, 1994; Abate and Ampofo, 1996). Zabrotes subfasciatus (Boheman) and Callosobruchus maculatus (Fabricius) are the most important species of bruchids attacking stored beans and peas, causing yield losses ranging from 38-100% (Schoonhoven and Cardona, 1986; Adane and Abraham, 1995; Abraham et al, 1994). Ahmed (2017a) reported an average grain loss of 60% within 3-6 months of storage period due to bruchids on common beans. The objective of the current experiment is to see the efficacy of different rates of filter cake on two species of bruchids attacking common bean and cowpea under laboratory condition
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