A chip with insecticide is added to prevent weevils from escaping. The interchangeable parts make the trap economical. The pheromone is a chemical called grandlure, a laboratory version of the weevil's own attractant, used by the insects to call each other together for mating. Fresh 10-mg doses of grandlure are placed in traps every 14 days. Armed with information on weevil populations provided by the baited traps, officials know when and where to apply necessary treatments.
Continuous trapping helps determine the treatment efficacy.
At very low populations levels, the trap also serves as a control device, ridding a field of the last few pests. Trapping with grandlure can detect weevils at lower levels than visual surveys. Producers should continue scouting their cotton for other pests, however, because the eradication program will treat for boll weevil only. Growers will continue to be responsible for control of other pests. Select early maturing cotton varieties.