SEX-PHEROMONE COMPONENTS OF THE FRUIT-TREE LEAF-ROLLER, ARCHIPS ARGYROSPILUS (WALKER) (LEPIDOPTERA, TORTRICIDAE), IN BRITISH-COLUMBIA

In held experiments in the Okanagan Valley, British Columbia, the pher omone blend of (11Z)-tetradecen-1-ol acetate (Z11-14:OAc), (11E)tetrad ecen-1-ol acetate (E11-14:OAc), (9Z)-tetradecen-1-ol acetate (Z9-14:OA c) and dodecan-1-ol acetate (12:OAc) at a 100:64:2:1 ratio (western FT LR blend) attracted significantly more male fruit-tree leaf roller (FT LR), Archips argyrospilus (Walker), than did the previously reported f our-component blend and modifications thereof. Addition of (11Z)-tetra decen-1-ol (Z11-14:OH) to the western FTLR blend in a ratio of 4% rela tive to Z11-14:OAc further significantly enhanced attraction. Compound s were identified and their ratio determined by coupled gas chromatogr aphic-electroantennographic (GC-EAD) and coupled CC-mass spectrometric analyses of female FTLR pheromone gland extracts and by retention ind ex calculations of candidate pheromone components. Determination and u se of geographically specific pheromonal blends may be required for op timal, semiochemical-based biorational control of FTLR and other lepid opteran orchard pests.