Lace wing Larvae Control Aphids on Greenhouse Snapdragons1

Abstract

Eight lacewing ( Chrysopa earned ) larvae per greenhouse snapdragon ( Antirrhinum majus ), released 4 at a time twice during 8 weeks effectively controlled aphids ( Myzus persicae ). Two initial sprays of malathion and nicotine sulfate 1 week apart followed by release of 4 lacewing larvae per plant also were effective. Flowers produced under chemical or biological control systems were equal in quality. Lacewing larvae in a 21°C greenhouse required a week longer to effectively control aphids than those in a 24°C greenhouse.