Ashraf EL-SAYED-1, Josef GÖDDE-2, Heinrich ARN-1
1- Swiss Federal Research Station for Fruit-Growing, Viticulture and Horticulture,
CH-8820-Wädenswil, Switzerland
2- 35753 Greifenstein-Nenderoth, Germany
Flights of male Lobesia botrana to synthetic blends, gland extracts and calling females were recorded in the wind tunnel. Pheromone solutions were released at defined rates using an aerosol applicator. As in previous reports, addition of secondary gland components to (E)-7,(Z)-9-dodecadienyl acetate enhanced male response as indicated by higher speed, straighter tracks and smaller track angles.
Optimum response was obtained by releasing 10 pg/min of diene in a mixture with 5% E7Z9-12OH, 1% Z9-12Ac, 1% E9-12Ac and 10% 11-dodecenyl acetate. The saturated acetates found in the gland were ineffective. This blend is superior to the diene on its own (straightness, 0.5 vs. 0.25, but not as effective as a female extracts (0.6). There is strong evidence for involvement of other female components.