Studies on the Biological Control of Rumex obtusifolius L., a Grassland weed, by Gastrophysa atrocyanea MoTs. (Colleopptera : Chrysomelidae) : II. Dispersal of Overwintered Adult Insects

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The native chrysomelid beetle, Gastrophsa, is a possible agent for use in the biological control of dock, Rumex obtusifolius, which is a noxious grassland weed in Japan. Two dispersal tests were performed by releasing marked overwintered adults in grasslamd fields to assess their potential for biological control. The beetles dispersed an area with a radius of almost 50 m around the release point. The farthest destance at which a beetle was recoverd was 106 m from the release point. Based on this finding, two release points perhectare of overwintered adults would be sufficient for the establishment of a colony in virgin grassland or for increasing their numbers where there is a low population. Female adults dispersed to greater distances than the males. Beetles dispersed both by walking (crawling) and flying. Their flight was observed most often around noontime on warm, windless days.
日本応用動物昆虫学会の論文
1979-02-25