Symptoms The disease was discovered in 1985 and 1990 in Sichuan, Hubei, Jiangsu, Zhejiang and Shanxi provinces. The system showed infestation. Some of the leaves of the diseased plants showed light mosaic, mottled, faded spots, or deformity. Some lobules were normal without obvious lesions. They were infected at the seedling stage, before the flowering stage, and had few or very small grains. It is a necrotic stain on the seed coat. In severe cases, a continuous necrotic zone forms on the outer seed coat. Dwarfing plants at the seedling stage, the top dead, the diseased leaves were discolored mosaic or deformity, a reduction of 40% to 80%, after the flowering period, the impact of disease is small.
The pathogen is Broad bean strain virus abbreviated as BBSV, which is called Vicia faba stain virus and belongs to virus. The virosomes are equal-diameter spheroids, 25-28 nm in diameter, capable of precipitating with antiserum from the British stained virus, and not reacting with the true mosaic virus antiserum. Bean plants such as broad beans and lentils are infested under natural conditions.
Transmission routes and disease conditions Vicia faba staining virus is mainly transmitted from pollen and seeds, and the seed poisoning rate is generally lower than 10%, and individual lines are as high as 18%. In Europe, the main insects of the virus-mediated media are Apion vorax and Sitana lineatu. The virus transmission rate is as high as 4%-16%, but it has not been seen in China. According to literature records, there are domestic long kisses. Elephant armor.
Control methods (1) Remove and destroy diseased plants in time to avoid virus transmission through seeds or mediators. (2) Strict quarantine system to prevent the spread of broad bean staining virus. Pay attention to collect phytosanitary information and strengthen isolation of foreign introductions.
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