Evaluation of yellow sticky traps at various heights for monitoring cotton insect pests.
Sticky yellow traps at 60, 80, 100, and 120 cm above ground level were assessed in various developmental stages of cotton for their relative efficiency in capturing the following pests in the Cukurova region of Turkey in 2001 and 2002: leafhoppers Asymmetrasca decedens and Empoasca decipiens, cotton whitefly Bemisia tabaci, and western flower thrips Frankliniella occidentalis. The leafhopper catch was significantly higher at 60 cm than at 80, 100, and 120 cm when plant heights were less than 80 cm. The number of leafhoppers on traps at 80 cm was similar to 60 and 100 cm but significantly higher than at 120 cm when plant heights were more than 80 cm. The numbers of western flower thrips were similar at 60, 80, and 100 cm but significantly lower at 120 cm when plant heights varied from 100 to 120 cm. Total catches of leafhoppers were similar at 60 and 80 cm but significantly lower at 100 and 120 cm. Numbers of whiteflies were highest at 60 cm and lowest at 120 cm trap heights at all plant heights. Trap height did not influence the total catches of western flower thrips, which were more abundant in late-season cotton. Most flights of thrips occurred within the plant canopy.