FIELD-TESTS WITH KAIROMONE-BAITED TRAPS FOR CUCUMBER BEETLES AND CORNROOTWORMS IN CUCURBITS

Sticky traps with and without the attractant TIC (1,2,4-trimethoxybenz ene, indole, and trans-cinnamaldehyde) were evaluated in cucurbits for capture of striped cucumber beetle, Acalymma vittatum (F.), spotted c ucumber beetle, Diabrotica undecimpunctata howardi Barber, western cor n rootworm, Diabrotica virgifera virgifera LeConte, and northern corn rootworm, D. barberi Smith & Lawrence, in New York and western striped cucumber beetle, Acalymma trivittatum (Mannerheim), and western spott ed cucumber beetle, Diabrotica undecimpunctata undecimpunctata Mannerh eim, in California. Traps with TIC lures captured more beetles than un baited traps for all species except for western spotted cucumber beetl e in 1 of 2 California trials. Yellow traps captured more striped cucu mber beetle and western spotted cucumber beetle than did white traps b ut did not increase capture of spotted cucumber beetle or western stri ped cucumber beetle. The response of the western corn rootworm and nor thern corn rootworm to TIC varied by time of day, the greatest respons e occurring around midday. Increases in TIC per trap resulted in incre ases in capture of western cucumber beetle, western striped cucumber b eetle, western corn rootworm, and striped cucumber beetle, but not for northern corn rootworm or spotted cucumber beetle. For cucurbits with short plant canopies, traps were most effective when placed close to the ground. In pumpkins with taller canopies, traps at canopy and midc anopy height captured the most beetles. The effect of trap height vari ed by time of day for spotted cucumber beetle, western corn rootworm, and northern corn rootworm, and the pattern Varied for the species. Se x ratio of captured beetles varied among species and time of day. Over all, western corn rootworm and northern corn rootworm were captured in greatest numbers during the middle of the day, whereas the greatest c aptures of striped cucumber beetle occurred between 1800 and 0600 hour s EST. Significantly greater numbers of striped cucumber beetle, weste rn corn rootworm, and northern corn rootworm were captured on the down wind side of traps. Traps replaced 2 times per day had greater capture s than traps replaced I time per day or 1 time every 2 d.