Newly boomed mite pest of papaya in Taiwan.
Eutetranychus africanus (Tucker) population of very high density was found to be the key pest in three screen-housed-papaya orchards in Gaoshu, Pintung County. Panonychus citri (McGregor) and Tetranychus sp. may occur simultaneously in much smaller population. This is the second time that Eu. africanus was reported as crop pest in Taiwan and the first time to be a key pest. More information is needed to understand the popularity of this mite in papaya orchards. The recognition of the different spider mite genera on papaya by the shape, habitat, and color was described concisely.