Hexane washes of boll weevils (Anthonomus grandis Boheman) exposed to Boll Weevil Attract and Control Tubes (BWACT) showed that the amount of malathion adhering to individual weevils increased as time on BWACT increased. Similarly, mortality increased as malathion accumulation on individual weevils increased, and as time spent on fresh BWACT increased. Malathion accumulation and mortality was not correlated as time spent on BWACT aged in the field for five months increased.