Corn in silk appeared to be effective in most cases in attracting moths of the cotton bollworm from cotton during a bollworm outbreak on cotton in Arkansas during the late summer of 1946. In exceptional instances, however, where cotton was heavily infested with aphids, severe bollworm injury continued notwithstanding the proximity of silking corn. In this and previous outbreaks, in all instances of severe injury no freshly silking corn was near the injured fields at the time the infestation of cotton began. Bollworm outbreaks appear to be favored not only by the occurrence of aphids, but also by dry, hot weather, which shortens silking during midsummer.