A more practical method than limb jarring is needed to monitor the plum curculio, Conotrachelus nenuphar (Herbst), in peach trees. Of 223 orchard visits made in Arkansas, traps captured plum curculio adults on 114 visits, whereas limb jarring did so on only 29 visits. Pyramid traps and jarring tree limbs along the orchard edge began to capture plum curculio adults 1 wk before the start of fruit feeding damage and continued to capture plum curculio adults until after harvest. Pyramid traps located at the edge of the peach orchard caught significantly more adults than did traps placed >30 m into the orchard interior or traps placed along the edge of an adjacent woodlot. Pyramid traps and screen traps captured similar numbers of plum curculio adults in 14 of 17 samples. Only one orchard in Oklahoma and another in Arkansas had smaller circumference tree trunks (<38 cm) than the other orchards resulting in significantly more plum curculio adults captured in pyramid traps than in screen traps. The screen trap was less expensive and sustained environmental conditions better than did the pyramid trap and may be used on trees >38 cm in circumference. The derived economic threshold of 0.045 plum curculio adults per pyramid trap per day equated to 1% new fruit damage. This study suggested that combining trap counts with percentage of new fruit damage should be used to make insecticide application decisions against plum curculio.
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