ヒメコガネ (Anomala rufocuprea MOTSCHULSKY) の発生調査のための性フェロモントラップの利用

概要

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Traps baited with 10 mg 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 1,630 m per night, most males were recaptured within 500 m from the release point. Relationship between the percentage of recapture (Y) and the flight distance (X) was represented by log Y=9.3068-1.4229 log X (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.
1986-11-25