Oviposition preference of the bean bug, Riptortus clavatus to sites on a plant and within a field, to plants at different developmental stages, and to different leguminous germplasms was observed. The insect layed its eggs mainly on the back surface of leaf in the upper half of plant in both observation from oviposition cage and soybean field. The egg number in fields were observed at a statistically-same rate in marginal and inside area, and at a median value of one egg per leaf in oviposited leaves. Full seed stage of soybean hardly affected oviposition preference of the insect. A statistically-significant difference in oviposition to different leguminous germplasms was observed.

Flower color of hairy vetch (Vicia villosa Roth) was observed individually in F2 of crosses among violet, white, pink flower varieties, and between pale pink and pink flower varieties for providing information of useful gene as source of colored flower. F2 segregation mode of flower color between cross of white/violet was fitted to 3 violet : 1 white, and same segregation ratio of 3 violet : 1 pink was found in F2 of cross of violet/pink flower variety. Also, F2 segregation of flower color between cross of pale pink/pink flower variety was fitted to 3 violet : 1 white. When white flower was crossed with pink flower, flower color in F2 population segregated into 9 violet : 3 pink : 4 white. Based on the results, this study indicated that flower color of parental varieties was controlled by recessive epistatic interactions of two genes, and pale pink flower color was recessive to the pink color of the parental variety. This flower color inheritance may be used for practical application in breeding of hairy vetch variety.