凹缘菱纹叶蝉的越冬习性与传播枣疯病的关系

 发现凹缘菱纹叶蝉(Hishimonus seⅡatus Uhler)是传播枣疯病的主要媒介叶蝉之一.在我国华北,它于8月下旬开始迁往枣林附近的松(Pinus tabulaeformis Carr)柏(Platycladus orientalis Franco)上,以成虫越冬,但不在松、柏树上繁殖世代.9月中旬迁移越冬进入盛期,10月份松、柏树上的虫口已达高峰;翌年4月中旬转移活动,5月上旬枣芽萌发期间全部迁离松,柏树.经接种实生枣苗证明:越冬后成虫仍保持较高的传染枣疯病的能力,每苗接虫2—5头,枣苗发病率达7.1—76:2%.试验也证明,带毒叶蝉的其子代叶蝉不再带毒。本试验同时证明,带病叶蝉不单纯是传病媒介,而且是一种相当持久的枣疯病侵染源,防治上应予以充分注意.

ON OVERWINTERING HABIT OF HISHIMONUS SELLATUS AND TRANSMISSION OF JUJUBE WITCHES' BROOM

Writers find out that Hishimonus sellatus Uhler is one of the major vectors of jujube witches' broom disease (JWBD).The experiment was carried out in field and greenhouse condition 1981 to 1985.The vectors usually migrates from jujube to nearby pine(Pinus tabulaeformis Carr.)and arborvitae(Platycladus orientalis Franco) from the end of August through October every year to overwinfer there in North China,The imagoes surviving after winter begin to leave the pine and arborvitae at about 15 th April the next year.However,H.sellaius does not breed any progeny on evergreen trees mentioned above.The inoculation on jujube seedlings with the wintered Ieaf hoppers demonstrated that the insects remained effecient for transmission of JWBD.When 2-5 insects were settled on each seedling,the incidence of JWBD varied from 7.1 to 76.2 per cent.The progeny of the insects fed on diseased jujube do not induce JWBD,if it was fed on healthy plant as soon as it was born.These facts additionally proved that Hishimonus sellatus Uhler were not only a vector of jujube witches' broom disease but also transmitted pathogen during the period between getting pathogen and death.