Lace wing Larvae Control Aphids on Greenhouse Snapdragons1

in Journal of the American Society for Horticultural Science
Brent K. HarbaughKansas State University, Manhattan

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Richard H. MattsonKansas State University, Manhattan

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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.

Contributor Notes

Received for publication on January 19, 1973. Contribution No. 517, Department of Horticulture and Forestry, Kansas Agricultural Experiment Station, Kansas State University, Manhattan.

Graduate Student and Research Horticulturist, Floriculture, respectively.

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