ABSTRACT
Deraeocoris pallens Reut. is the most commonly observed predator in cotton fields of Çukurova region in Turkey. Population developments D. pallens and other cotton pests were monitored in four different cotton fields in 1992 and 1993. The number of aphids, spider mites, thrips and whiteflies were counted on fifteen cotton leaves randomly taken from each field at weekly intervals. D. pallens populations were monitored by using insect net and vacuum samples. In both years, adults of D. pallens were first observed alongside the increase of aphid populations, reaching a peak by late June and then declining as aphid populations declined. Populations of D. pallens stayed at low levels in the absence of aphid populations and then started to increase again with the population increases of thrips, whiteflies, and spider mites. Winter surveys indicated that D. pallens overwintered as adult on various plants, including citrus and pine trees, winter vegetables, and some other wild flora

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