Abstract: In order to grasp the change regularity of meteorological conditions under which the corn spider mite is prone to happen and dissipate,and to effectively mitigate the red spider corn hazards,the influence of meteorological condition on red spider-hit time,degree and key time to yield were analyzed based on the observation data of red spider and meteorological data from 1991 to 2007. Statistical analysis showed that there was relationship between the spider's harming fastigium and mean temperature in autumn. Mean temperature had increased rate 0.2 ℃ per year in Autumn,surpassing the date of suitable growing temperature for red spiders and,the peak of spider mite's attack against maize were tending be later. The number of overwinter spider mites,first appearing period,harming fastigium,injury ration of plant and loss of yield were investigated and relationship between these factors and meteorological factors such as mean temperature of ten-days,month air temperature,the ground temperature,relative humidity,transpiration,precipitation,sunshine duration were assessed. The model for forecasting the red spider' action had been set up,which could be applied into practical production.

Key words: Red spider, Red spider, Harming, Corn, Meteorological condition