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一、发生及侵染过程。小麦散黑粉病是由花器侵入的系统侵染病害,种子带菌,一年只侵染一次。小麦播后,带菌的种子萌发时,潜伏在种胚内的菌丝体也开始萌动,并随小麦的生长发育向上发展,到小麦孕穗期间,菌丝体在小穗内迅速发展,破坏花器,形成菌孢子,使麦穗变成黑粉。病菌孢子成熟借风、雨传播,小麦扬花期遇多雾和小雨有利于病菌孢子萌发和侵入花器,造成种子带菌。带菌种子当年不显症状,播种后,第二年随小麦的生长发育才长成黑穗。
First, the occurrence and infection process. Wheat powdery mildew is a systemic infection disease invaded by flowers, and the seed is inoculated only once a year. After the sowing of wheat, the mycelium lurking in the embryo germinated and germinated with the growth and development of the wheat when the germinating seeds germinated. During the booting stage of wheat, the mycelium developed rapidly in the spikelet and damaged the flower arrangement. Bacterial spores are formed, turning the ears into black powder. Bacteria spores mature wind, rain spread, wheat flowering occasions encounter fog and light rain is conducive to the germination of germs and invade flowers, resulting in seed carrier. Carrying the seeds that year was no significant symptoms, sowing, the second year with the growth of wheat grow into black ears.