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灰稻虱是水稻黑条矮缩病和条纹叶枯病的介体昆虫。黑条矮缩病毒在虫体内循回期多数为17—19天,终生带毒,但不经卵传毒。获毒最低温度在8℃以下,在4—5℃不能传毒。 灰稻虱在浙北平原一年发生6代,第1和第3代长翅型成虫大量迁飞,通过麦→早稻→晚稻途径,完成病毒和介体的生活环。病毒的主要感染期,早稻在5月下旬到6月上旬的早栽本田前期,单季晚稻在6月下旬到7月上旬,双季晚稻在7月中旬到8月初的早栽本田前期和秧田期,大、小麦在年内苗期。 在连片种植,选用耐病品种等农业防治的基础上,抓住冬前麦苗期,早栽晚稻本田前期喷药杀灭介体,能基本控制本病害。
Gray flies are the mediators of rice black-streaked dwarf and striped leaf blight. Black-streaked dwarf virus in the worm most of the return period of 17-19 days, lifetime poisoning, but not by egg transmission. The minimum temperature of poisoning below 8 ℃, 4-5 ℃ can not poison. Gray pests occurred in the North Zhejiang plain for 6 generations a year. The first and third generation of long-winged adults migrated in large numbers and the living ring of virus and mediator was completed through the route of wheat → early rice → late rice. The main infection period of the virus, early rice in late May to early June early Honda early May, single late rice in late June to early July, double late rice in mid-July to early August early Honda early planting and seedling Period, large, wheat seedling during the year. In contiguous planting, the selection of disease-resistant varieties and other agricultural prevention and control on the basis of grasping the winter wheat seedling stage, early planting late rice Honda kill the mediator can basically control the disease.