SURVEY OF OCCURRENCE AND DISTRIBUTION OF RHYZOPERTHA DOMINICA IN DIFFERENT GRAIN STORAGE SITES LOCATED IN ELEVEN PROVINCES OF CHINA

Rhyzopertha dominica Fabricius is one species of ten main insect pests of stored grain and distributed in partial provinces of China according to publications.The lost caused by the insect depended on the occurring situation and environmental condition.Knowing the occurrence and distribution of the insect should be beneficial to the integrated management.A survey on occurrence and distribution of the insect was carried in 78 prefectural-cities of eleven provinces stretched across four stored grain ecological regions of China,by the method of on-site sampling and collection.Total number of 505 units were invested that included in grain depots,feed mills,paddy rice mill,flour mills,farmer grain storages and grain markets.There no collection of R.dominica in six prefectural-cities surveyed of Liaoning Province.R.dominica was collected in twenty prefectural-cities among of twenty eight prefectural-cities belonged to Shanxi,Shandong and Henan Province.The R.dominica collection record existed in all forty four prefectural-cities of Hubei,Hunan,Zhejiang,Fujian,Guangdong,Yunnan and Hainan Province.As the results from surveyed provinces in north China R.dominica was collected more in grain process mills than that in grain depots and farmer storage.And R.dominica was collected much in grain process mills,grain depots and farmer storage meanwhile.There was a little difference in the insect collecting unit number among of the surveyed enterprise.And there no obvious difference among of the invested enterprise type on R.dominica collection in the provinces which the insect was collected in all prefectural-cities.