甘蔗斑点象生物学及防治的研究

甘蔗斑点象是云南甘蔗上另一种新的严重蛀食地下蔗头的害虫，主要以幼虫在甘蔗地下蔗头内为害，为害期8～9个月，受害蔗每666．7m2减少0．5～0．3t，并缩短了宿根年限。此虫1年发生1代，无越冬现象，有喜湿性，不能飞翔，主要通过沟河流水传播。在河川坝地、沙壤地中虫口较多，宿根年限越长受害越重。蔗稻轮作，缩短宿根年限翻蔸烧蔸，结合松蔸培土每666．7m2用3％米乐尔或3％甲基异柳磷颗粒剂4kg，防治效果达90％左右。

Studies on the bionomics of Diocalandra sp. and its control

This study was conducted mainly in jingdong County, Yunnan province, during 1992-1995. Diocalandra sp. is other soil-inhabiting pest to the sugarcane stumps in yunnan. The date obtained from both laboratory obeervations and field survey show that the weevil passes one grneration a year. The biological characteristies and behaviour of the different slages were closely describel. Practice crop rotation between surgarcane and rice, aviod keeping two -year old rhizom of raton and pratice ploughng out them to be burued up in February -May ctc.By applying 3% miral or 3% isofcnphos-mcthyl 4kg /666.7m2 when loosen the soil and hill up, the efficency reached about 90%.