The present study determines the infestation potential of Callosobruchus chMensis and C. macu/atus on seeds of seven pulse crops. The tested crops were cowpea, mung bean, lentil, chickpea, kidney bean, peas and broad bean. The parameters of evaluation included susceptibility index values, weight loss and some biological activities. The results showed that seeds of the kidney bean were completely resistant to infestation by both bruchids while seeds of the cowpea and mung bean were completely susceptible. The other four pulses were found to have varying degrees of susceptibility. However, it was also found that, all studied crops were more susceptible to C chinensis than to C maculatus