ISOLATION AND IDENTIFICATION OF FEMALE SEX-PHEROMONE AND DEVELOPMENT OF A SEX ATTRACTANT FOR LACANOBIA-SUBJUNCTA

Extracts of terminal abdominal segments of female Lacanobia sub juncta contained (Z)-11-hexadecenyl acetate, (Z)-11-hexadecenal, and (Z)-11- hexadecenol at a ratio of 1:0.2:0.02. (Z)-11-hexadecenyl acetate and ( Z)-11-hexadecenal were most effective as a lure for trapping males whe n loaded in rubber septa at ratios near 3 : 1, respectively. The compl ete three-component blend was most effective as a lure for trapping ma les when loaded in rubber septa at a ratio of 3:1:0.08 for the acetate , aldehyde, and alcohol, respectively. In a comparison of doses of thi s three-component blend, greatest numbers of males were captured with 6.1 mg per rubber septum. These components, when loaded with an optimu m ratio of components and suitable dose, should provide a useful lure for trapping Lacanobia subjuncta in agroecosystems, permitting monitor ing of distribution, emergence, and flight periods.