Color Attraction of Western Flower Thrips (Frankliniella occidentalis Pergande)

Abstract

Spectral reflectance (SR) from 400 to 700 nm, Munsell And values of L*, a*, b* of 22 colored boards covered with transparent sticky sheeting were measured. Trapping tests for western flower thrips, Frankliniella occidentalis were carried out using these boards in a mandarin orange (Citrus unshiu Marc.) Orchard in Shizuoka Prefecture, Japan in 1994. More adult thrips were trapped on pink, red-purple, purple, and blue-purple boards. The spectral characteristics of the attractive colors (AC) were determined from the relationship of SR curves and trap catches. Increasing SR from 400 to 440 nm and high SR at around 450 nm, decreasing SR from 470 to 530 nm, and SR low at around 550 nm, and increasing SR from 560 to 600 nm and high SR at around 610 nm are considered important in AC. The last spectral characteristic seems to have a synergistic effect. The SR curve of mandarin orange peel changes mainly between 500 and 700 nm with ripening, but AC spectral characteristics were not clearly observed in any coloration stage. © 1995, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.