Abstract
Developmental success and oviposition of five different populations of Panonychus mori Yokoyama on 46 species of plants were studied. The populations were collected from five species of trees: muku (Aphanantha aspera (Thunb.) ), peach (Prunus persica (L.) ), Japanese pear (Pyrus pyrifolia var. culta (Makino)), moonseed (Cocculus trilobus (Thunb.)) and mulberry (Morus bombycis Koidz.). The host range of the mulberry population was considerably different from those of the other four populations: the mulberry population of spider mites was able to use only 2 species as host plants, whereas the others could use 9 species. The muku, peach, pear and moonseed populations were reproductively compatible with one another, while the mulberry population was bidirectionally incompatible with other populations and produced a small number of F1 adult females. Thus, the mulberry population was determined to differ in host range and reproductive traits from the other populations.

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