墨玉县果树介壳虫发生规律研究及防治对策

介壳虫是近年来在和田地区严重危害果树的主要害虫之一。常见的种类主要有糖槭蚧、枣大球蚧、圆梨蚧。糖槭蚧、枣大球蚧在墨玉县一年发生1代,以2～3龄若虫在枝条上或隐蔽的树皮裂缝处越冬。梨圆蚧一年发生2～3代,以1～2龄若虫在枝干上越冬。介壳虫的危害盛期,第一次为越冬若虫自树液流动至成虫产卵期(或产仔),此时为化学防治关键适期,最佳适期为3月下旬～4月初。第二次危害盛期为小若虫孵化(或产仔)到若虫进入越冬,此时最佳化防适期为6月5～25日。该虫防治应采用综合防治措施,尽量减少药剂防治次数。

Research on Fruit Tree Shell Insect's Occur Frequency and It's Prevention Countermeasure in Moyu County

Recent years in Hetian district shell insects become one type of most harmful insects for fruit tree. Parthenolecanium corni (Bouche), Eulecanium gigantea (shinji), Quadraspidotous perniciosus (Comst)is main occurs in Moyu county. Parthenolecanium corni (Bouche), Eulecanium gigantea (shinjin))produce in a year one generation two or three year old nymph life through winter in tree twig or tree bark clearage。 Quadraspidiotus perniciosus( Comst)produce in a year two of three generation one or two year old nymph life through winter in tree stem.Shell insects most harmful period first time from tree fluid moves time till matured.insects ovulation,this period is optimal to chemical prevention optimal time from and if march to early April.Second time from ovulation till dormancy optimal time for chemical prevention is from fifth of June till twenty-fifth of June.For prevention of shell insects danger we must be use general prevention methods to decrease insecticide usint times.