The results from statistical analysis show that both the title leaf mites have their own wide niche breadthes and a wide niche overlap. The time-dynamic spatial niches of the two leaf mites are positively correlative with their own population densities.These show that two mites have similar utilization of resources and that the mites are characterized by "gradual spread and then whole-tree damaged". The niche separation of the two mites is on upper and lower faces of leaf and on some small "area" of the low...