Nursery, Greenhouse, and Landscape News

San Jose Scale is Alternate Prey for Euonymus Scale Predator


Chilocorus kuwanae is a small black beetle from Korea that feeds on euonymus scale. It was introduced in the National arboretum in Washington, D.C. in 1984, and has since spread to other areas, devouring local infestations of euonymus scale from euonymus plantings. This tendency for the beetle to eat itself out of house and home has made it difficult to establish long lasting populations in landscapes. Studies in Maryland showed that the beetles can survive and reproduce on San Jose scale, a common pest of woody plants in the rose family, but not on obscure scales, common pests of oak. Although no field trials were conducted, this study shows that other scale hosts present in Midwestern landscapes may be used to support populations of C. kuwanae.

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