New trap for survey of species structure and seasonal dynamics of phytoseiid mites on Japanese pear trees (Acari: Phytoseiidae).

A simple new trap (Phyto trap) was invented to increase the trapping efficiency of phytoseiid mites in a pear field. The trap was made of woolen yarn, hook and loop fasteners and vinyl tape. It successfully trapped many live phytoseiid mites alive when used on Japanese pear trees. Trapping efficiency was also evaluated by comparison with conventional observations of leaves, confirming the trap usefulness. Ten known species and one newly recorded species of phytoseiid mites belonging to two genera were trapped on the pear trees. The seasonal dynamics of each species were clarified. Amblyseius tsugawai was most abundant throughout the seasons. Both A. eharai and A. paraki were also abundant, but showed some seasonal fluctuations. Amblyseius eharai became abundant following an increase in the Panonychus citri population, but A. paraki abundance seemed to have no relation to the populations of prey mites.