INVESTIGATION ON OCCURRENCE AND DISTRIBUTION OF PRIMARY STORED GRAIN INSECT PESTS IN SOME PROVINCES OF CHINA AND THEIR MANAGEMENT EMPHASIS

For the scientific and effective management,an investigation on distribution and occurrence of ten primary insect pests,Rhyzopertha dominica(Fabricius),Tenebroides mauritanicus(Linnaeus),Plodia interpunctella(Hübener),Sitotroga cerealella(Olivier),Sitophilus zeamais Motschulsky、S.oryzae Linnaeus、Araecerus fasciculatus(Degeer)、Callosobruchus chinensis(Linnaeus)、Bruchus pisorum(Linnaeus)、B.rufimanus Boheman,in grain storage was done that onsite insect collection was carried in 480 grain storage enterprises belong to 81 prefecture-level cities of 11 provinces China respectively,from 2016 to 2017.The scientific management emphasis was discussed according to insect habits.S.zeamais、S.cerealella and T.mauritanicus were collected from all 11 provinces invested.S.oryzae and R.dominica were sampled only in some invested provinces.There were 20 prefecture level cities with R.dominica collection among of 28 investigated cities for Shanxi,Shandong and Henan Provinces.R.dominica was found in all 44 prefecture level cities belong to Hubei,Hunan,Zhejiang,Fujian,Guangdong,Yunnan and Hainan Province,respectively.S.oryzae was collected from Guangdong,Yuannan,Fujian,Hunan and so on,as reported as before.The new collection records of S.oryzae were gotten from Zhejiang,Hubei,Henan,Shangdong Provinces.The prefecture level cities collected S.oryzae included Ningbo,Huzhou,Taizhou,Wenzhou and Jinhua of Zhejiang Province,Enshi,Xianning,Wuhan,Macheng,Jinzgou and Jinmen of Hubei Province.Prefecture level cities collected S.oryzae involed in Nanyang,Pingdingshan,Luoyang,Luohe,Zhoukou and Shangqiu among of the 17 investigated cities.There was S.oryzae collection only from Qingdao other than other investigated cities,such as Hezhe,Rizhao,Yantai,Liaocheng,Jinan and Linyi of Shandong Province.There almost existed S.zeamais,S.oryzae,R.dominica,P.interpunctella and S.cerealella in investigated stored cereals.T.mauritanicus was collected from non-grain storage sites in mills usually.There was a occasional collection for A.fasciculatus,C.chinensis and B.rufimanus.There was no B.pisorum collection in this whole survey.In the practice,the behavior of the insect pest should be considered in the management.And the control emphasis should be on S.zeamais,S.oryzae,R.dominica which are cereal borer,hidden eating and serious damage insects.The insect killing action should be early done for hidden immature stages.The hidden insect monitoring and cereal bored adult trapping should be done more and more in grain storage.