Abstract: Eotetranychus populi (Koch) is an important mite pest of Salicaceae in North China. The principal biological characteristics and the effective accumulated temperature were studied. The results showed that the duration of development stage was negatively correlated with temperature ranging from 16 to 28℃. It was foundthat the developmental zero of egg was (8.77±0.83)℃ and the effective accumulated temperature of the egg stage was 100.0±5.96 day-degree. The developmental zero from larva to adults was 9.64±1.60℃ and the effective accumulated temperature from larva to adults was 113.3±13.88 day-degree. The developmental zero for whole generation was (8.67±0.92)℃ and the effective accumulated temperature of wholegeneration was 218.2±14.37 day-degree. In addition, process of laying eggs, egg number one female, the longevity and mating at different temperature were studied.

Key words: Eotetranychus populi (Koch), bionomics, effective accumulated temperature