摘要： 玉米粗缩病(MRDV)是七十年代以来河北省部份玉米产区的主要病害之一,严重病田因病绝收毁种.经研究明确了此病害是由灰飞虱传播的病毒病害,病原是具双层衣壳的球形病毒.田间冬小麦上的“绿矮型”病株,包括与丛矮病毒(WRSV)混生的矮缩病株是玉米粗缩病的初侵染来源.在玉米上传毒并造成危害的主要是灰飞虱的第一代成虫.此病在玉米不同主育期的感病程度差别较大,芽鞘期至七叶一心期的病情指数为55.0—67.9%,八叶一心期为35.0%,而十至十二叶期极轻,仅2.8%.为此提出了以调整播期为主的农业措施结合药剂的综合防治.包括:治麦保秋;选用抗病品种,调整播期,即春玉米提前在四月份播种,套种玉米推迟到麦收前几天播种,扩大麦收后毁茬播种的面积;结合定苗拔除病株;加强管理及药剂防治.经一万一千余亩大面积防治示范,病株率由防治前的58.3%压低到15.0%,病情指数由防治前的29.6%压低到4.4—5.3%.与不防治田相比,病株率降低78.1%,病情指数降低77.9%.

关键词: 玉米, 粗缩病, 发病规律, 防治

Abstract: Studies indicate that the disease is caused by a virus pathogen.The visions arc spherical shaped and enwrapped with double--layer capsule."I'he winter wheat plants with“dark-green dwarf" sy mptom and those stunted plants dou-ble-infected with GVheat Rosette Stunt Virus(WRSV) and MRDV are the ini-tial source of inoculum."I'he planthopper(Laodelphax Striatallus Fallen)is the vector of this visa:and the adul1 cf it:first er.eration is the main agent for distribution of this·irus causing dan;age to corn.The disease index caused by this virus varies greatly with the time of infection in respect to the grow-th stages of corn.1'he disease index is 55.0-67 for 9%seven leaves and a whorl,whorl stage and:y for eight Ica:and a whorl,id still copped to 2.8% for eleven or twelve leaves.The integrated program control is pried mainly on the rearrai:gctncnt of planting clai‘:and measures, such as WRSV disease prevention for demir:;shing-the source of inoculum,plan-ting tolerant cnlti、acs,eradication of[!isc sed >c,.dlinvs,favorable cultural practices and chemical control."I"he large de;;;on:tration area of.33ha has proved this integrated program to be effecti:e.The contrast is sharp.The per-ccntage of diseased plant is depressed from. 58.3% to 15.0% and the disease index from 29.6% to 4.4-5.3% cornparin; to the pre、ions culttmc nontreated. The comparison to the neighbouring fielc?:in the sane year non-treated shows that the percentage of diseased plant ana the disease index are depre>sed by 78.19%and 77.9% respecti、ely.

Key words: Maze, Rough dwarf virus disease, Occurrence pattern, Disease conteol