Captures of the Oriental Fruit Moth,1the Pecan Bud Moth, and the Lesser Appleworm in Georgia Field Trials with Isomeric Blends of 8-Dodecenyl Acetate and Air-Permeation Trials with the Oriental Fruit Moth Pheromone2

Abstract

Maximum captures of male oriental fruit moths (OFM), Grapholitha molesta (Busck), in sticky traps were obtained with a blend of 95% ( Z )-8-dodecenyl acetate (DDA) and 5% ( E )-8- DDA plus dodecyl alcohol; however, captures of male pecan bud moths (PBM), Gretchena bolliana (Slingerland), were unaffected by alterations in the amount (from 0 to 20%) of the E -isomer. The hours of maximum response of OFM (5–8 pm) to ( Z )-8-DDA differed markedly from the hours of maximum response of PBM (10 pm-3 am) but were about the same as those of the lesser appleworm (LAW), Grapholitha prunivora (Walsh). Response to pheromone traps at 4 different heights indicated that captures of PBM were greatest when traps were 9 m above ground, but more OFM and LAW responded when they were 1 m above ground. Air-permeation trials with microencapsulated ( Z )-8-DDA applied at rates of 2 and 8 g lure/acre, suppressed response of male OFM to traps baited with virgin females. On the basis of captures of released-marked males in the untreated orchard, suppression was 77–98% in the orchard treated with 8 g lure/acre for the 5 wk after treatment. The recapture rate of the released males by pheromone traps in the untreated orchard was quite high (69%).