Abstract: Based on the meteorological data and the occurrences of the Sitodiplosis mosellana Gehin in the East Hexi Corridor from 1998 to 2007,the occurrence dynamic,the critical period and the meteorological causes for the occurrences of the Sitodiplosis mosellana Gehin were analyzed. The meteorological prediction models were built by using SPSS software. The results showed that the main meteorological factors affected the occurrences of the Sitodiplosis mosellana Gehin in the East Hexi Corridor were temperature and precipitation. The lower winter temperature in February was,the later cocoon breaking,pupating and imaqo beginning of the Sitodiplosis mosellana Gehin were. The precipitation from February to May was favorable to the occurrence and development of the Sitodiplosis mosellana Gehin. The soil temperature at the 10cm soil depth was significantly related to the activities of the Sitodiplosis mosellana Gehin,while it was 6-8℃ higher than in the plain area of the river banks. The cardinal number of overwintering of the Sitodiplosis mosellana Gehin was obviously restricted by the average minimum temperature in September. The extreme minimum ground temperature in January and the average temperature in the second ten days of June to the first ten days of July were main meteorological factors affected occurrences of Sitodiplosis mosellana Gehin for the prior and later period in a year.

Key words: Sitodiplosis mosellana Gehin, Sitodiplosis mosellana Gehin, East Hexi Corridor, Meteorological conditions, Prediction model