Study On Occurrence Regularity And Ecological Niche Of Main Pests In Akesu Jujube

Jujube is one of the fruit tree development of Xinjiang Featured Forestry and fruit industry, with therapid development of Jujube industry, coupled with the increase of planting years and the rapid expansionof planting area of Jujube in Xinjiang,diseases and insect pests of Jujube are becoming more and moreserious, and has the characteristics of variety, wide distribution，seriously affecting the yield and quality ofred dates, but also restricted the healthy development of red dates industry. Grasping jujube pests species，biology characteristics and ecological niche can provide the scientific basis for integrated control of jujubemain pests in study area. This paper mainly investigates the types of pests and natural enemies of jujube,and based on it，the occurrence regularity and population dynamics of main pests of jujube and followingeffect with natural enemies；at the same time, masters spatial distribution pattern of Scythropus yasumatsuiet Morimoto and Dasineura datifolia Jiang, exploration the ecological niche of main pests and naturalenemies in the jujube orchard. The followng is the results：1. The main pests of jujube orchard in Xinjiang Awati are belongs to7order,18families and26species. Nature enemy have21species in all, including predatory17species and parasitic4species.2. Host plant of Eulecanium gigantean（Shinji）has20families and45species, whether single orcomplex habitat, the damage of Eulecanium gigantean（Shinji）is most heavy on jujube, mid July to earlyAugust is the damage stage；the damage of Dasineura datifolia Jiang in the tree has four peak periods,respectively in late May, early May, late June and in mid July, the predator and Dasineura datifolia Jianghas a strong following effect；The damage of Tetranychus truncates Ehara and Tetranychus cinnabrainus（Boisduval）reach the highest peak in midAugust；the damage peak of Lygus pratensis L., respectively inmid May, late June, early July and mid September；Ancylis Anchylopera sativa Liu larva occurred in jujubeleaf expansion period, blossom period and fruit coloring period；the most serious period of damage ofScythropus yasumatsui et Morimoto is late April to the early5.3. The spatial distribution of the Eulecanium gigantean（Shinji）on the trees was belongs to theaggregate pattern，and between individual attract each other. Insect aggregation numbers greater than2,indicating that the aggregation was caused by both its behavior and environmental conditions or one of thetwo reasons. The mathematical statistics analysis results show that population densities had no significantdifference in the east, south, west and north4directions, in plants, the insect density had significantdifference, the order is middle> lower>upper. At the same time, the suiTablele sampling quantity model ofthe different larvae density was presented on the base of the spatial pattern analysis.The spatial distribution of the Dasineura datifolia Jiang on the trees was belongs to the uniformdistribution pattern, and between individual repel each other. Population aggregation numbers less than2,insect densities had no significant difference in the east, south, west and north4directions, in plants, theinsect density had significant difference, the order is upper>middle> lower.4. The pests and natural enemies have a certain difference in monoculture jujube, jujube wheatintercropping orchard and30years old orchard. The differences of temporal among species in jujubeorchard niche are larger, the niche breadth is relatively large and the niche overlap is relatively small. Fromthe view of common pests and natural enemies, compared with pests, horizontal niche is wide, verticalniche is narrow, the niche overlap value of insect pests and their natural enemies with the same habits andfeeding sites is high.