Rate and timing of Heliothis zea (Boddie) emergence in selected sites of maturing corn in East-Central Texas (Burleson County) were measured during 1986 and 1987. Nocturnal insect flight behavior was monitored in the test areas with an entomological radar, and certain meteorological variables were measured and recorded. The data emphasize the importance of corn as a host crop for bollworms which subsequently are a pest to cotton. Total measured moth production was 0.65 and 4.25 moths/m,6 in 1986 and 1987, respectively. Most of the insect flight activity observed with radar was at altitudes of less than 300 M, especially in 1987, indicating that displacement of observed insects was primarily local or mesoscale.