Study On The Species And Three Important Species Of Main Poplar Leaf Eating Insect In Huocheng Areas

As the main planting species of artificial shelter forest,poplars play an important role in improving the local ecological environment.In recent years,poplar pests is a common group in Huocheng ares,and local areas have reached severe levels,which has seriously affected the ecological value and economic value of poplar trees.In the study,the occurrence patterns,forecasting methods and comprehensive control techniques of Lymantria dispar,Orthosia incerta,Cerura menciana in Huocheng area were studied.The findings are as follows:1.There are 24 species of Populus L.insect in Huocheng areas,including 19 species of Lepidoptera,3 species of Coleoptera,and 2 species of homoptera.Lymantria dispar,Orthosia incerta,Cerura menciana are common insect;Gypsonoma minutara,Chrysomela populi,Agelastica alni orientalis are occasional pests;Hyles livornica,Protoschinia scutatus,Stilprotia salicis,Catocala electa,Anacampsis populella,Conchia mundataria,Spodoptera litura,Pandemis chondrillana,Botyodes diniasalis,Leucoptera susinella,Leuoma candida,Apocheima cinerarius,Neoris haraldi,Malacosoma neustria,Plagiodera versicolora,Pemphigus populi Courchet,Cicadella viridis are take place but is not a disaster.2.The Lymantria dispar,Orthosia incerta and Cerura menciana are all harmed by larvae feeding on poplar leaves and buds.Among of them,Lymantria dispar and Orthosia incerta occur one generation a year,and Cerura menciana occurs two generations a year.Adults of the three leaf-eating pests all have phototaxis.The leaf blade loss rate exceeds 30 % when the number of standard branches of three types of pests reaches 4.3.In Huocheng District,the early hatching time of the Lymantria dispar is similar to the pale yellow time of elm money,and the early stage of the emergence of adult Orthosia incerta is close to that of willow and elm.The first hatching time of Orthosia incerta larvae is similar to that of willows.In the early stage of the emergence of adult Cerura menciana,the leaf time was similar to that of poplar.The reference values of the initial accumulation temperature of larvae of three kinds of leaf feeding pests from the first hatching to the third Instar larvae were Lymantria dispar 235.5 degrees,Orthosia incerta 299.5 degrees,and Cerura menciana 273.1 degrees.4.According to Light induction,fly natural enemies can be used to prevent and control three kinds of pests,artificially eradicate egg block to prevent and control the Lymantria dispar,and prevent and control the Orthosia incerta during the pupa period.In the 3-instar larval stage,20 % of cyanoamethrin 1000-2000 times liquid,2 % of avivins 3000 times liquid can be used to control three kinds of leaf-eating pests,and 1000 times of young urea 3 can be used to control the Lymantria dispar and Orthosia incerta.2% avermectin smoke can be used to control the Lymantria dispar and Cerura menciana,the agent Yangmengni 3 smoke can be used to control the Orthosia incerta and Cerura menciana.