Tuesday, 16 November 2004 - 8:36 AM
0058

Effect of food sprays on recruitment and oviposition of Chrysoperla rufilabris (Neuroptera: Chrysopidae) in pecan orchards

Brian A. Kunkel, bkunkel@saa.ars.usda.gov and Ted E. Cottrell, tcottrell@saa.ars.usda.gov. USDA-ARS SE Fruit & Tree Nut Research Laboratory, 21 Dunbar Road, Byron, GA

Pecans are attacked by a complex of aphids throughout the southeast. The feeding damage of the aphids reduces photosynthesis and can cause early leaf abscission. Augmentation of natural enemies in pecan orchards is a viable alternative to insecticide application. The green lacewing, Chrysoperla rufilabris Burmeister, is an important predator found in pecan orchards. Food sprays that contain wheast, tryptophan, or caryophyllene have demonstrated attractiveness to green lacewings in other crop systems. Female lacewings need a protein and carbohydrate source for egg production. Our objective was to increase the number of lacewings and lacewing eggs in pecan orchards prior to the second seasonal peak of aphid populations. We hypothesized that these compounds would attract lacewings to pecan orchards and promote increased oviposition. We tested this hypothesis in both field and laboratory experiments. Field tests were evaluated on terminals of 20 yr old trees and our laboratory experiments used y-tube olfactometer assays.


Species 1: Neuroptera Chrysopidae Chrysoperla rufilabris
Species 2: Homoptera Aphididae Melanocallis caryaefoliae (black pecan aphid)
Keywords: lacewings, tryptophan

See more of Ten-Minute Papers, Section Ca. Biological Control, Cb. Apiculture and Social Insects, Cd. Behavior and Ecology, Cf. Quantitative Ecology
See more of Ten-Minute Papers, Section C, Biology, Ecology, and Behavior

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