The Investigation On The Main Forest Pests And Pesticides Seletion In Qingyan Area Of Fushun City

In this paper,the main forest pests in three locations,Wan Dianzi town,Nan Ko uqian town and Da Gujia town of Qingyuan County,Fushun City,Liaoning Province were selected as research objects.The species,quantity,community characteristics,distri bution characteristics of main pests in different forest branches and the degree of har mful in the three research sites were investigated and analyzed by the method of step up and standard survey,and carried out chemical control experiments on three main f orestry pests in Qingyuan.The results are as follows.1.2215 specimens of forestry pests were collected in 3 regions in Qingyuan County of Fushun city,which belong to 6 orders,59 families and 112 species.Analyzed from the level of insect classification,the number of lepidoptera was 51,for the most,accounts for 45.54% of all.The second was coleoptera,which accounts for 28.57% of all.The remainder were smaller,which accounts for 25.89%.2.Through investigation,it was found that Ips subelongatus and Massicus raddei were the main pests in the standard plot,while Dendrolimus superans did not occur large-scale damage,but had potential risks.The above three forest pests were used as the objects of pesticide control experiments.3.The relative abundance of phytophagous insects was the highest,which is 89.27% and the number of leaf-eating insects was the highest,which was 85.25%,followed by stem-borers 3.52%,underground insects 0.44% and fruits 0.06%.Among the predatory natural enemies,ladybugs were the largest,which is 4.76%,followed by carapace 0.19%,aphid-eating flies 0.09%,ant maggots 0.05%,insectivorous tadpoles 0.06% and predatory bugs 0.03%.The largest number of parasitic natural enemies were the wasps 0.99%,followed by wasps 0.37 %.Other insects were 4.09%.Wan Dianzi Town has the highest species richness,which is 109,followed by Da Gujia Town 99,Nan kouqian Town had the lowest species richness 76;Wan Dianzi Town had the highest diversity index,4.43,followed by Da Gujia Town,4.23,Nan Kouqian Town 3.98 is the lowest;Nan Kouqian Town had the highest evenness,0.99,Wan Dianzi Town was the second,0.92,Da Gujia Town was the lowest 0.88;Nan Kouqian Town has the highest ecological dominance,which was 0.0536,followed by Da Gujia Town 0.0381.The lowest town was Wan Dianzi Town,0.0312.4.Different dilutions of the pesticides were carried out,and then indoor screening of the pesticides was carried out to select the most reasonable concentration as the pesticides for outdoor control test.Through outdoor control experiment,it was found that trichlorfon powder had the best control effect on Ips subelongatus,the control effect on pine borer was faster,the control effect on Dendrolimus superans was best by 2.5% dichlorfenamide,the control effect of Bt wettable powder was faster,and the control effect of green Weilei(1:300)on Massicus raddei was the best.Through the investigation of main forest pests in Qingyuan Country,the occurrence and characteristics of major forest pests in the area were clearly grasped,and provides some theoretical basis for forest protection and pest control and it was of great significance to enhance forest stability and forest resource conservation in Qingyuan County.