Wheat Shuttle Stripe Mosaic Virus Disease

The symptoms are also known as wheat yellow mosaicism. The disease is serious on winter wheat. After the infection, the symptoms did not appear before winter, and the symptoms occurred only during the spring wheat returning green period. The infected strains produced chlorotic stripes on the new leaves after 4-6 leaves of the wheat, and a few of the leaves distorted and deformed, and the chlorotic stripes increased and spread later. The lesions are associated with irregular and irregular strips of varying widths and widths. The shape of the lesions is like a shuttle. The old diseased leaves gradually turn yellow and die. The diseased plants had fewer tillers, atrophy, and poorly developed root systems. The severely diseased plants were significantly dwarfed.

The pathogen Wheat spindle streak mosaic virus is abbreviated as WSSMV, and is called wheat streak spot mosaic virus, also known as wheat yellow mosaic irus. Is a potato virus Y group. The virions are linear and range in size from 200 to 300013 (nm). The roots and leaf tissues of the diseased plants contain typical wind wheel-like inclusion bodies. Passivation temperature of 50 ° C for 10 minutes, the dilution limit 1000-1000000 times. Different areas have different virulence, and there is a significant difference in disease resistance among varieties.

Transmission routes and disease conditions Shuttle mottle virus is mainly transmitted by sick soil, diseased roots, and diseased fields. It can also be spread by sap rubbing. It cannot be spread by seeds or insects. The media is a kind of Polymyxa graminis Led. that lives in the soil. The fungus is an obligate parasite of the wheat root and does not cause any damage to wheat itself.

It is obviously harmful. After winter wheat sowing, the polymyxobacteria of the cereal valley produces zoospore, infects the root of the wheat seedling, develops into a plasmodium in the root cell, and the virus then invades the root to proliferate and expands upward. The winter wheat virus was dormant and showed symptoms in late spring. After harvesting of wheat, the dormant spores of Oxycotocidae grow over summer. The virus can live in the soil for more than 10 years with its resting spores. The soil temperature is about 15°C, and the soil moisture is relatively high, which is favorable to the zoospores activity and infection of Polygonum multiflorum. Above 20°C or drought, infestation rarely occurs. Early onset of sowing is heavy and sowing is delayed.

Prevention and control methods (1) Selection of resistant, disease-resistant varieties used year-round

TC 6, 8165, 80, 86, Xifeng, Ningfeng, Jinan 13, Yanshi 9th, Shannong 7895, Xiyu No. 8 and other excellent disease-resistant varieties. (2) Crop rotation and non-host crop rapeseed, barley, etc. for many years of rotation can reduce the incidence. Winter wheat was sowed late in time to avoid the most invasive period of the virus-mediated mediator. Apply base fertilizer to improve disease resistance at seedling stage. (3) Strengthen management to avoid transmission through diseased debris, diseased soil, and other means.

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