Abstract
The effect of adult feeding on fungi, the powdery mildew (Sphaerotheca fuliginea (S.) POLLICCI) and the rust (Uromyces azukicola S. HIRATA) was analyzed on adult longevity and fecundity. Seasonal changes in the number of immigrants of the azuki bean weevil, Callosobruchus chinensis L., into the azuki bean field were determined. Longevity and fecundity after their immigration were investigatd on the host plant, Vigna angularis W., growing in the bena field. When the powdery mildew and the rust were supplied to newly emerged adults, their mean longevity elongated to three times that of control without food supply and the total number of eggs increased to about twice that of the control. The immigration of the weevils into the field was observed continuously from late August to late October, and was found to be most frequent in early September. Maximum longevity of the immigrans was 51 days in female and 39 days in male; both periods were shorter in later immigration. Females immigrating into the field were meature, but they never oviposited before the pods had matured. They laid eggs only on mature pods in the field from mid-September to mid-October. Females which immigrated in early or late September laid most of their eggs in late September.
