Response of the Greenhouse Whitefly (Homoptera: Aleyrodidae) and the Vegetable Leafminer (Diptera: Agromyzidae) to Photospectra1

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Abstract
Spectral reflectance measurements were conducted on six series of color pigments to determine the photo tactic sensitivity level of the greenhouse whitefly, Trialeurodes vaporariorum (West-wood), and the vegetable leaf miner, Liriomyza sativae (Blanchard). Plywood stakes were painted with color pigments and then coated with a clear adhesive to trap insects. Results indicated that maximum response of the greenhouse whitefly occurred in the yellow-green region from 500 to 600 nm. In contrast, blue light energy from 400 to 490 nm inhibited whitefly and leaf miner capture. The direction of flight was dependent on the surface texture reflectance characteristics of the stake. The proper choice of trap material and color pigment provided evidence for a feasible whitefly-leafminer control program in greenhouses.

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