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the rice leaf rerler, Cnaphalecroeis medinalis Guenee, collected from fields and by light trap in 1977 and 1978, It became crear that the proportions of the mated females fluctuated extremely by season. Most of the females collected in the paddy fields mated from ,June to early September. Thereafter, the proportions of mated females declined greatly up to mid-October, when almost all female moths contained immature ovaries and abundant fat body in their abdornens. From late October threugh the rest of the season the mated females, rnost of which leoked lean, increased considerably in number. Some difi'erence of the reproductive conditions was also neted among the three kinds of sarnples : female moths collected in the paddy fields, in the grassy fields and those captured by Iight trap. Some possible causes for the disappearance of the mated females in autumn are discussed.

applied entomology and zoology

Seasonal Changes of the Proportions of Mated Females in the Field Population of the Rice Leaf Roller, Cnaphalocrocis medinalis GUENEE (Lepidoptera : Pyralidae)