Winter irrigations (mid November, December, or January) of emergence cages containing buried green cotton bolls and their associated diapaused larvae increased mortality of the insect compared to February and later irrigations. Irrigations in the spring caused a shut down of moth emergence followed by a flush of emergence, the peak of which can be estimated by calculation of heat units. Valley-wide captures of male moths in gossyplure-baited traps and captures of male and female moths in emergence cages are similarly affected by ambient temperatures--a reduction in temperature resulting in a reduction of moth captures.