Research On Forest Pests In Karamay City And Chemical Control Assay

Karamay is located in the west of Junggar Basin,mainly in the desert area of Gobi,which is a typical temperate continental climate.,The natural vegetation is mainly Populus euphratica,Haloxylon ammodendron,Tamarix chinensis,etc.The ecological environment is relatively bad.In order to improve the ecological environment,the area of artificial forest is increasing.But with the increasing of the area of plantation,the problem of forest diseases and insect pests is becoming more and more obvious.In order to improve the occurrence,distribution and harm of forest diseases and insects in Karamay City.During the period from March to September of 2017,the pests trees in Karamay City were investigated,and the pesticide test of main pests were carried out in the agricultural development zone of Karamay City.Based on the investigation of forest diseases and insect pests in Karamay and the historical data of local forest control stations,the occurrence trend,interannual dynamics and risk assessment of common major diseases and pests in Karamay are analyzed.Some suggestions for the prevention and control of major forest pests in Karamay are put forward.In addition,the control experiment and principles of main forest diseases and insect pests in different stand types was carried out in Karamay Agricultural Development Zone.The results of this study are as follows:1.Through the four boroughs of Karamay city forest pest symptoms,distribution,damage degree and occurrence area were investigated,found 176 species of forest pests,50 species of natural enemies.(101 kinds of phyllophagous insect,21 species of sucking pests,28 species of stem borer,19 underground pests,seed pests of 4 species,and 3 species of Acarina arthropod animal).Forest disease has 56 kinds,including 3 species of seed and seedling diseases,34 species of leaf diseases,1 species of fruit diseases,13 species of branch and stem diseases,4 species of root diseases,1 species of parasitic seed plants.2.Monosteira unicostata(Mulsant er Rey),Quadraspidiotus slavonicus(Green),Parathrene tabaniformis Rott,Melanophila decastigma Fabricius,Scolytus schevyrewi Semenov,Fumago vagans Per.,ect were widely distributed species and occurred all over the city with serious hann.Apocheima cinerarius Erschoff,Quadraspidiotus slavonicus(Green),Cytospora chrysosperma(Pers.)Fr.,ect were the dangerous species pests in Karamay city,and we need to enhance the strength of control.3.Among the different stand types,timber forest with the most species and the most serious damage degree,among which,the stem borer is the most serious.The second was shelterbelt,the most serious was leaf eating and sucking pests.And in Green Forest Belt,pests are occurenced lightest.In the same forest types,the main pests in the mixed forest are less harmful than in the pure forest,which indicates that the mixed forest is helpful to reduce the occurrence and harm of forest diseases and insects.4.Karamay Agricultural Development Zone forest base is a poplar plantation,the main pests are Apocheima cinerarius Erschoff,Trioza magnisetosa Log,Orthosia incerta Hufnagel,and so on.Chemical control of the main forest pests was carry out in the carbon sink forest base,it was found that 3 kinds of insecticides 5%triflumuron(dilution 1000 times solution),0.3%Matrine(diluted 200 times solution)and 1.8%Abamectin(dilute 1000 times solution)mixture,Beta cypermethrin(diluted 1000 times solution)were used to control the different ages of Apocheima cinerarius Erschoff larvae respectively.The rate of prevention and reduction was 96%,92%and 99%,respectively.Beta cypermethrin(dilution 1000 times solution)was used to control Trioza magnisetosa Log and Orthosia incerta Hufnagel,the control rate was all reached 90%.And Imidacloprid was not suitable for the control of Trioza magnisetosa Log,after control,the density of insect population increased.The control effect of Methidathion E.C(dilution 250 times solution)on Drosicha corpulenta(kuwana)was efficiented,in the green belt of pure poplar forest,the reduction rate of control was more than 83%.5.In view of different stand types in Karamay,the corresponding control principles and suggestions were put forward,and the occurrence of diseases and insect pests in Karamay was also discussed."The main diseases and pests control calendar of Karamay city" was compiled.