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灰飞虱Laodelphax striatellus(Fallen)是水稻条纹叶枯病(Rice stripevirus)的传毒介体。水稻分蘖期前感染病毒后,心叶卷曲而后枯死;拔节期后感病,穗部大多畸形扭曲不实。70年代云南中部地区的富民、姚安、大姚、易门、禄丰、永胜、昆明等县市都曾发生,部分地区整片枯死甚而成灾。1982年从易门县秧田分别捕获越冬代成虫和第一代若虫带回本所室内进行传毒特性研究,结果表明:在平均气温19.6℃条件下,水稻条纹叶枯病毒在灰飞虱体内的循回期平均为12.7天,终身带毒,能连续传毒或间歇传毒。健稻喂饲带毒虫30分钟即能染病,以秧苗2—3叶期最易感染。雌虫自然带毒率和获毒率分别比雄虫高出33.3％及55.6％。
Laodelphax striatellus (Fallen) is a transmission mediator of rice stripevirus. After the tillering stage of rice infected with virus, the heart leaves curly and then dead; susceptible after jointing, most of the deformed spikes malformed. In the 1970s, Fumin, Yao’an, Dayao, Yimen, Lufeng, Yongsheng and Kunming in the central region of Yunnan Province had taken place. Some areas even withered and even died. In 1982, the overwintering generation adults and the first generation nymphs were captured from the seedling of Yimen County, respectively, and were taken back to our laboratory to study the transmission characteristics. The results showed that under the conditions of average temperature 19.6 ℃, The average follow-up period is 12.7 days, with life-long poisoning, can be transmitted continuously or intermittent poisoning. Healthy rice feeding with poisonous worms can be infected in 30 minutes to 2-3 leaf stage seedlings most easily infected. The natural virulence and virulence of females were 33.3% and 55.6% higher than that of male, respectively.