Field tests on attractiveness of the synthetic sex pheromone of the peach fruit moth, Carposina niponensis Walsingham (Lepidoptera: Carposinidae).
The synthetic pheromones (Z)-7-eicosen-11-one (compound A) and (Z)-7-nonadecen-11-one (compound B) were used in field tests in apple and peach orchards in Aomori and Fukushima Prefectures, Japan, to trap adult males of Carposina niponensis Wlsm. A polyethylene capsule and a polyethylene cap were better than 2 different types of rubber septa as dispensers of compounds A and B (20:1) when 0.1-0.3 mg pheromone mixture was used/trap but there was no difference at 1-3 mg/trap. The catches of males increased as the amount was increased from 1 to 3 mg/dispenser. Compound B did not appear to have a synergistic effect and equally good results were obtained with compound A alone. Attraction was not enhanced by the addition of (E)-isomers of compounds A and B or (Z)- and (E)-7-alken-11-ones of carbon number 17, 18, 21 and 23 at a level of up to 10% of the 20:1 mixture.