Pheromone trapping of Synanthedon tipuliformis (Lepidoptera : Sesiidae) inWashington red currants

Collections of volatiles, ovipositor extracts, and electoantennography show ed the sex pheromone of female currant borer moths, Synanthedon tipuliformi s (Clerck), from Washington to be a 2-component (100:3) blend of (E,Z) -2, 13-octadecadienyl acetate and (E,Z) -3, 13-octadecadienyl acetate. Pheromon e-baited sticky traps (rubber septa dispensers) captured male S. tipuliform is at one abandoned and two commercial red currant sites (one treated with insecticide, one untreated) in south central Washington from 19 May to 16 A ugust 2000. Peak catches occurred during late May and June with up to 200-3 00 moths/trap/wk. Lowest numbers (overall mean: 4.8 +/- 0.9 moths/trap/visi t) were recorded at the insecticide-treated site and largest numbers (39.6 +/- 5.5 moths/trap/visit) occurred at the untreated, commercial site.