Abstract
Traps baited with 10mg methyl (Z)-5-tetradecenoate in a plastic capsule were used to survey the occurrence of males of the soybean beetle in the field. Seasonal prevalence of the beetle monitored by a pheromone trap and a black-light trap coincided with each other. In three different traps, i.e., pheromone trap, virgin-female trap and black-light trap, the maximum number of catches was recorded 30 to 60 min after sunset. The pheromone trap attracted the beetles for a longer period of time in a day compared to the virgin-female trap. A larger number of the beetle were caught in the traps located in an open field near host-plant crops. Average recovery in mark-release-recapture experiments was 38.6%. Though the maximum flight distance was a radius of 1, 630m per night, most males were recaptured within 500m from the release point. Relationship between the percentage of recapture (Y) and the flight distance (X) was represented by logY=9.3068-1.4229logX (r=0.8945). The males attracted to the black-light trap were 3- to 4-days younger than those attracted to the pheromone trap. Trapping efficiency of the pheromone trap was negatively correlated with the female/male ratio of the beetles.
