A pesticidal/ovicidal composition comprising: (a) 50-99.9 parts by mass of a triglyceride containing not less than 50% of oleic acid as a fatty acid component; (b) 0.1-20 parts by mass of a nonionic surface active agent; and (c) 0-30 parts by mass of a glycerin derivative. The composition according to the invention has not only a pesticidal activity but also an ovicidal activity on crop pests, and provides a safe and high pesticidal/ovicidal effect.
