SEX-PHEROMONE TRAPS FOR MONITORING THE PEACH TWIG BORER, ANARSIA-LINEATELLA ZELLER - EFFECT OF PHEROMONE COMPONENTS, PHEROMONE DOSE, FIELD AGING OF DISPENSER, AND TYPE OF TRAP ON MALE CAPTURES

The effects of ratio between sex phermone components, pheromone dose i n the dispenser, aging of dispenser in the field, and trap type on tra pping efficiency of males of the peach twig borer, Anarsia lineatella Zeller (Lepidoptera: Gelechiidae), were investigated. To attract males , the optimal ratio between pheromonal components in a binary blend co ntaining (E)-5-decenyl acetate (E5-10:Ac): (E)-5-decenol (E5-10:OH) wa s 72:28 or 83:17. Dosages of 7 or 0.7 mg of the binary blend containin g E5-10:Ac: E5-10:OH (72:28) were equally effective in attracting male s. The effect of aging of dispenser (Israeli dispensers, loaded with 7 mg pheromone) in the field on trapping efficiency was moderate. Captu res in traps baited with 4-week-old septa did not differ from those in traps baited with 1-week-old septa. The fairly slow loss of attractan cy exhibited by rubber septa indicates that septa may be used for at l east 4-5 weeks. At high population levels, the nonsticky IPS trap was significantly more effective in capturing males than the sticky Pheroc on 1C trap; at low populations, however, the Pherocon 1C trap was bett er.