Mung bean virus disease

Symptoms Mungbeans may develop after emergence to adulthood. Mottled or green parts of the leaves are uneven and the leaves are shrinking. Some varieties show deformed leaves or veins, diseased plants dwarf, late flowering. Symptoms on pods are not obvious.

The pathogen Cucumber mosaic virus is abbreviated as CMV, which is called Cucumber Mosaic Virus; Alfalfa mosaic virus is abbreviated as AMV, and the first Jianghuazhou virus; Tomato aspermy virus is abbreviated as TAV, and tomato infertility virus is called. CMV virus particles spherical, diameter of about 35nm; toxic temperature 65-70 °C, 10 minutes, the dilution limit 1000-10000 times, in vitro 3-4 days of toxic period, not dry. AMV granules are rod-shaped, with a diameter of 18 nm and a length of 58.3 nm. The virus has a wide host range and infects 47 families such as Solanaceae, Cucurbitaceae, and Caike, in addition to invading leguminous plants; the disease sap dilution limit is 1000-1,140,000. Times, passivation temperature 55-60 °C, in vitro virus protection period 3-4 days. 1 TAV virus particles spherical, diameter 20-50nm, dispersed in the cytoplasm and nucleus, dilution limit 100 to 100000 times, lethal temperature 50 to 60 °C, in vitro survival of 3 to 6 days, infestation of mung bean, kidney bean, cowpea, tomato Wait.

Transmission routes and disease conditions CMV seeds are non-toxic and mainly live on perennial perennial plants. Since yarrow grass, anti-branch, physico-pig, etc. are the overwintering hosts of the aphids, such as Myzus persicae and Aphis gossypii, the locusts begin to move or migrate after germinating in the spring and become the main medium for spreading the disease. Onset temperature of 20 °C. The occurrence of AMY is closely related to the occurrence of aphids. In particular, high-temperature and dry weather not only benefits aphid activity, but also reduces host resistance. TAV mainly rely on juice and peach aphid for non-persistent transmission.

Prevention and control methods (1) Use anti-virus disease varieties such as Lu Yin No. 1 and Fu Qing No. 1. (2) Aphids must be sprayed into soybean fields in time to spray commonly used acaricides for prevention and control in order to reduce drug transmission. (3) Initiating spraying of antiviral (0.5% Mushroom proteoglycan) 250 to 300 times or 20% of virus A wettable powder 500 times, or 15% of virus will be WP 500-700 times liquid.

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