Damage Degularity and Control Techniques of Eulecaium gigantean Around Tarim Basin in Xinjiang

Eulecaium gigantean (Shinji) has entered Xinjiang since the 1970s and mainly spread in the areas such as Haotan, Kashgar as well as Aksu. Eulecaium gigantean (Shinji) has one generation each year in Tarim Basin,two-year nymphae settle on the tree trunk to pass winter and start to absorb food from the trunk by pricking in the late March and the middle of April. Covering an area of 0.0666×104 hm2 in 1986 to that of 3.5747×104hm2 in 2010.The area inflicted by the insects has been on the rise dramatically, reaching 0.9300×104hm2 in 2004,declining in 2008, arriving at 60hm2 in 2010. Among the eleven types of trees investigated,P.bolleana,with 3.3% of plants indlicted, is listed as the least inflicted trees and the most seriously damaged is Robinia pseudoacacia, followed by red dates, white wax, almond, white elm,apricot, peach, Juglans regia L.peach, apple tree and P.bolleana.The investigation also shows that intercropping wheat and corn among apricot trees is helpful for its natural enemy,blastothrix sericea to parasite in Eulecaium gigantean. Both biopesticides and chemical pesticides are effective in preventing and controlling the damage caused by the insects with effect from 85 to 90% and from 73 to 87% respectively.