Study On The Ecology Niche And Spatial Pattern Of Euzophera Pyriella And Valsa Canker

Euzophera pyriella Yang, a subfamily of Lepidoptera Pyralididae, is widely distributedin XinJiang and is characterized by larva eating fragrant pear tree trunk, as well as mainbranch phloem. Also, the larva mine the phloem and xylem to form irregular tubes in whichfull of worm dung,and cuase rot disease invasion, leading serious damage to its hostplant..Valsa canker is a destructive disease on fragrant pear that causes serious economiclosses. The Pathogen penetrates extensively into the host truck and branch as well ascollateral and twig bark, causing some ymptoms mainly include the ulcer type and branchblight type2types and weakening the tree. This paper studies the Euzophera pyriella Yangand Valsa canker of niche and the spatial pattern, the major results were summarized asfollows:1.Euzophera pyriella Yang and Valsa canker have caused heavy damage to Aksu reginoof fragrant pear.There is a damage rate of up to100%in some gardens.The extent of thedamage has a closely relationship with orchard management level. Reasonable cultivationmanagement and the scraping bark control as soon as possible,timely removaling of litter anddisease branch pile may effectively reduce Euzophera pyriella Yang and Valsa canker occur.2.In this study, the survey data using a array of different judgments spatial distributionpattern of the aggregation index to calculate, the aggregation index shows that Euzopherapyriella Yang and Valsa canker the spatial distribution of aggregate type, conforms to thecharacteristics of most insects belong to general aggregation distribution.3.This paper study on the niche differences between Euzophera pyriella Yang and Valsacanker of fragrant peer tree.discussed the interspecific relationships between Euzopherapyriella and Valsa canker. The results showedthat they occured at the same time and sameposition.and had a closely niche breadth.Niche overlap was so high in similarity. Knowing thespatial distribution variation regular of Euzophera pyriella Yang and Valsa caner in spatialsequence could provide scientific methods for fragrant pear tree diseases and insect damagecomprehensive ecological control.4.Establishing the Models of space variation between Euzophera pyriella Yang larvaand Valsa canker by semi variance function use geostatistical method, and use the GS+7.0software to simulate the spatial distribution of data interpolation and numerical modeling.Theresults suggested that the clumped patch of Euzophera pyriella Yang larva and Valsa canke infragrant pear tree can mimic exploting the Spatial interpolation. The dependence rangerespectively range from18.77to41.00m,3.02to35.63m. The local spatial continuity variedfrom0.69to0.77and0.65to0.95. the larvae and spot of fragrant pear tree were characterizedby strong spatial clustering.The spatial distribution patter of Euzophera pyriella Yang larvaand Valsa canker showed they had the similaly clumped distribution.