沙棘象生物学特性及防治的研究

经过几年的调查,我们发现沙棘象对沙棘种实的危害相当严重。1987年延安南泥湾林场沙棘的种实因该虫为害颗粒无收,在榆林、铜川也有类似情况。为此,1987-1989年我们在陇县关山对其生物学进行了研究。一、分布、形态特征及为容(图1) 沙棘象(Curculio hippophes Zhang)分布于陕西省的陕北、渭北和关山等地区,沙棘种子被害率达20-80％。成虫除产卵时在果实上留有产卵孔外,还啃食果皮作为补充营养,使果实失去利用价值。幼虫蛀食种仁并引起大量落果。

STUDIES ON THE BIONOMICS AND CONTROL OF CURCULIO HIPPOPHES(COLEOPTERA:CURCULIONIDAE)

The weevil Curculio hippophes Zhang is a seed bores of Hippophae rhamn-oides L. , which usually causes serious damage to it. It widely distributes in H.rhamnoides forests in Liaoning Gansu and Shaanxi Provinces. There is one ge-neration a year, pupation occurs as full-grown lavral in mid-June. Emergencebegins in early July with a peak from late July to early August. The just ha-tched larvae occur in mid-August. Hibernation takes place in mid-October. Theadults are very active from 11-20 hours. Copulation and oviposition occur from16-19 hours. Stubbing the trees of seriously infected H. rhamnoides fover inwinter or spraying 2.5% decis at a dilution of 1:5000 to the adults during thepeak emergence period may obtain significant effectiveness.