Investigation Of Insect Pests And Natural Enemies Of Protected Vegetables And Control Techniques Of Whitefly In Shenyang

Vegetable protected production,as a characteristic industry of Shenyang,kept the high speed of growth in recent years,which played an important role in increasing farmers' income.However,the problem of vegetable diseases and insect pests becomes more and more important,which has seriously affected the development of the vegetable industry of Shenyang.In order to solve this problem,the field investigation and stick insect trapping investigation were studied in a severely damaged vegetable greenhouse in Shenyang.The main pest species and natural enemy species are indentified on protected vegetables,such as tomatoes,peppers cucumbers and eggplants.In order to provide theoretical data and technical support for the sustainable development of the protected vegetable industry of Shenyang.The comprehensive prevention and control technology of whitefly is studied based on the previous results.The main results are as follows.1.The investigation results of pest species showed that there are 40 species of pests in protected vegetable production in Shenyang area,which belong to two classes,39 species belonging to 24 families in six orders of Insecta,and one species of Arachnid were found.There are different dominant species on different vegetables.The dominant pests on Lycopersicon esculentum Mill.,Capsicum annuum L.,Cucumis sativus L.,Solanum melongena L.and Vigna unguiculata L.are Trialeurodes vaporariorum,Bemisia tabaci,Frankliniella occidentalis,Aphis gossypii,Myzus persicae and Tetranychus urticae.Liriomyza sativae caused slightly damage in individual tomato sheds.Phytomyza sp.caused slightly damage on beans.2.The investigation results of insect species collected on the sticky plates of greenhouse vegetable showed that there are many kinds of insects,and the main pests are thrips,white leaf miners,liriomyza and the aphid.The sticky insect board can be used for preventing,while the comparison of the aphid trapped amount and field investigation data showed that the effect of the aphid was lower.3.The result of field investigation showed that there are 12 species of natural enemies of vegetable pests in Shenyang,belonging to three orders of seven families.the dominant host of leaf miners are Diglyphus isaea(Walker)and Opius sp.The dominant host of Myzus persicae is Aphidius sp.The dominant predator of the aphid is Eupeodes corollae.Leucopis glyphinivora(Tanasijtshuk)is newly recorded for Liaoning province,and the larvae prey mainly on the aphid.4.The result of the sticky insect boards showed that there are 37 species of natural enemies belonging to 24 families of five orders trapped on.The dominant natural enemies of the aphid are Aphelinus varipes(Foerster)and Eupeodes corollae.In the greenhouse where Encarsia formosa was released,Encarsia formosa on the sticky insect boards accounts for 46% of the natural enemies,which showed that sticky insect board has attracted effects to Encarsia formosa,Aphelinus varipes(Foerster)and Eupeodes corollae.The hosts of other dominant groups on the sticky board: Anagurs incarnatus(Haliday),Apanteles sp.,Basalys sp.and Paridris sp.need to be further identified and studied.5.Through the research of whitefly control technology,it is concluded that the use of Encarsia formosa to control whitefly has a good long-term effect in the occurrence period of whitefly.Chemical control also had obvious inhibitory effect on the population growth and decline of whitefly,but the population resumed to rise soon after medication.Therefore,biological control combined with physical and chemical control will be the main direction of future development.