赖草条纹花叶病的病原及其寄主的研究

THE STUDY OF THE PATHOGEN AND HOST OF THICKSPIKE wILDRYE STRIPE MOSAIC DISEASE

本文报导了赖草条纹花叶病是由冰草麦蚜(Diuraphis(Holcaplis)agropyronphaga Zhang)的毒素引起的一种害状。甘肃主要分布在河西及中部地区。赖草的典型症状是叶部产生淡黄色条纹及条点,向正面卷曲,扭曲成绳索状。潜育期5天,若虫、成虫传毒力无差异。根据对21种植物试验,此毒素可引起小麦、大麦、黑麦、莜麦、谷子、高粱、玉米、赖草、披碱草、长芒草受害,但不为害糜子、稗草等10种植物。对野燕麦尚须进一步研究,此病系国内首次报导。

Thickspike wildrye stripe mosaic disease was caused by the toxin of Diuraphis (Holcaphis) agropyronphaga Zhang.This disease was mainly distributed in the Hexi and Centre areas of Gansu province.The typical symptom of this disease was yellowish stripe mosaic,leaf twisting to rope.The latent period was 5 days. There are no difference in ability of transmission between nymphs and adults.From 2] plant species tested, Triticum aestivum L.,Hordeum vulgare L.,Secale Cereales L.,Avena nuda L.,Setaria italica L.,Zea maydis L., Sorghum vulgare pers.,Aneurolepidium dasytachys (Trin.) Nevski,Clinelymus cylindricus (Franch.) Honda,stipa bungeana Tria,showed symptom.But panicum melicaceum L.,Echinochlora crusgslli Var.hispidula (Retz.) Hon- ta etc 10 plant species were symptomless.Further study are need for Arena fatua L.,This disease was re- ported for the first time in China.