Studies On The Insects Species In Pear Orchards And The Population Dynamics Of Codling Moth And Oriental Fruit Moth In Xinjiang

Thepaperstudiedthattheinsectspecies ,occuringdynamicof thecoldingmothand theorientalfruitmoth with pheromone trapping in the pearorchards and apple orchardsof AkesyDistrict in Xinjiang . Themainconclusionsareasfollows :1. The insect species in the pear orchards indicated there were 9 Orders and 59 Familes ,which included 8Orders , 31 Familes of pests , 6 Orders 18 Familes of neutral pests and 5 Orders 18 Familes of naturalenemies . InXinjiang the key pest of pear orchards have Apochemia cineraius Erschoff , Cydia pomonellaL., Grapholitha molesta Busck , Euzophera pyriella Yang , Apochemia cineraius Erschoff , Januspiriodorus Yang ,sp. n., Eotetranychus pruni (Oundemas) , Tetranychus turkestani Ugarov et Niko1ski,Psylla chinensis Yang et Li , Cacopsylla jiangli (Yang et Li), Cacopsylla pyri(Linnaeus), Aphiscitricola Van der Goot , Aphunostigma jakusiensis Kishida , Quadraspidiotus perniciosus ComstockRhodococcusturanicusArchParthenolecaniumcorni(Bouche) andStephanitisnashi EsakietTakeya.2.The codling moth occurs four generations a year , the emerge peak as moth of the winter generation isaboutApr. 24 , Theorientalfruit moth occursfive generations , approximatlySep.2 the emergeofitsadultreach peak . Overlapping phenomenon of two pests were distinct,in particular the second generation andthe third generation , the third generation and the fourth generation , so the first generation should be thekeystage ofchemicalcontroltoefficiencilyreduceoffspringandcardinalnumberofthewintergeneration .Besides comparing to the trapping moth effect in apple and pear orchards indicatedthat the codling mothprefer to apple ,the oriental fruit moth prefer to pear ,therefore they reacted host of two pests is diffent tosome extent.3.Based on the data from investigation , adopting Taylor power principle and Iwao's regression analyticalmethod determined distributing pattern: First , when average density of codling moth adult is m<3,distributing basic element is massing of individual and massing intension would increase along with hoistof grops density , but distributing basic element in m≥3 is uniformity distributing of individual repellentone another.Second , distributing basic element of oriental fruit moth is individual attraction each other,inaddition , distributing would more uniformity toghter with hoist of grops density. Besides , in a certaintyprecisionoptimumtheorysample patternoftwopestswereestablished.4. The mathematical modelin time sequence ofpopulation dynamics ofcodling moth of wintegeneration,the first generation colding moth, the oriental fruit moth of winter generation and the first generationoriental fruit moth where produced with pionomic mathematics methods were reflected very occurrenceconditions oftwopests.Themathematicalmodelsareasfollows:N_t=0.02669·t^3.07095·e^-0.26881t R=0.9373N_t=5.27497×10^-7·t^6.70833·e^-0.24771t R=0.9074N_t=6.742796·t^0.2035·e^-0.134623t R=0.9838N_t=0.000401·t^3.83919·e^-0.184042t R=0.9277...