Abstract
Developmental success, oviposition of five different populations of Panonychus mori on 46 species of food plants were studied. The populations were collected from five species of tree (muku (Aphananthe aspera), peach, Japanese pear (Pyrus pyrifolia var. culta), moonseed (Cocculus trilobus) and mulberry). The host range of the mulberry population was considerably different from those of the other four populations - the mulberry population was able to use only 2 species as food 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 bi-directionally 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
