In some areas, it is predominantly TBW or CEW, and in other areas, there is a mixed population. This is not uncommon late in the season as we normally see overlapping generations of the two species. Species ratio of TBW and CEW is very important when selecting an insecticide, especially in areas where pyrethroid resistant TBW is a concern. We are seeing quite a bit of variation in species makeup from field to field at this time. Scouts should be observant for moth activity when scouting.
Moths are most active after sunset but some can be seen during the day while walking fields.
TBW and CEW moths can be easily recognized. Each forewing has three slanted, dark bands. CEW moths are yellowisholive in color with a dark spot on the forewing. Bollgard cotton has provided excellent control of TBW, but some treatments for CEW have been needed. Control of large TBW is very difficult.