A 10-YEAR STUDY ON THE APPLICABILITY OF PHEROMONE-BAITED TRAPS FOR MONITORING THE EUROPEAN CORN-BORER (OSTRINIA-NUBILALIS HBN) IN THE FEDERAL-REPUBLIC-OF-GERMANY .1. DISTRIBUTION OF PHEROMONE STRAINS AND TESTING OF DIFFERENT TRAP TYPES, BAITS AND TRAP SITES

Since 1981, the suitability of pheromone-baited traps for monitoring t he European corn borer has been investigated in several regions of the Federal Republic of Germany (mainly in South Hesse, Rheinland-Pfalz, Baden-Wurttemberg and Bavaria). In all regions with remarkable corn bo rer damage, the Z-strain of the moth was of superior importance as com pared to the E-strain and associated hybrids. At least in South Hesse, the 'Pherocon 1C-trap' (Zoecon, USA) with an ECB-I bait as well as th e 'Biotrap' (Hoechst AG, FRG) with 20-mu-g or 60-mu-g of 97 Z-: 3 E-11 -tetradecenyl acetate per dispenser proved to be useful. For reduction of catches of non-target insects in 'Biotrap' traps, a green or black painting of the white-coloured trap is recommended.