The progress of invasion of insect pest, the Mexican been beetle, Epilachna varivestis in Nagano [Japan] Prefecture
2010
Nakamura, H., Shinshu Univ., Minamiminowa, Nagano (Japan). Faculty of Agriculture | Shiratori, S.
The investigation on defoliation of Phaseolus vegetables by the Mexican bean beetle Epilachna varivestis Mulsant was carried out at Guatemala high land in September, 2004. E. varivestis density is low and ratio of parasitism was 46.7%. From our survey in Guatemala, is not a serious pest because of natural enemies. From the investigation data of E. varivestis for 8 years, we can make the database of distribution and injury index in Nagano Prefecture. From the analysis of the database, distribution areas of this insect were expanding during 8 years, and speed of expansion was not so fast. Two species of parasitic wasps, Pediobius foveolatus and Nothoserphus afissae, were identified from E. varivestis. It was founded from the high percentage of parasitism that these wasps might be the cause of decreasing injury by this insect, and these native natural enemies may suppress the density of E. varivestis.
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