Virus disease is a common bacterial disease of potato. There are three main manifestations of symptoms: one is mosaic type: leaf chlorophyll is unevenly distributed, and it is thick green and white, yellow-green and green mottled mosaic, and when the leaves are severe, the whole plant is shrinking. Dwarf. The other type is a bad leaf type: the leaves turn inwards along the main vein or from the edge, become hard and leathery, and in serious cases, each leaflet assumes a cylindrical shape. There is also compound infection, causing necrosis and plaque in the potato.

In order to effectively control potato virus disease, the following methods need to be taken:

1. Use non-toxic seed potatoes to reduce the initial infestation source.

2. Improve cultivation measures, remove diseased plants as soon as possible; implement intensive farming, high ridge cultivation, timely earth-cultivation, avoid partial application of nitrogenous fertilizer, increase application of phosphorus and potassium fertilizers, pay attention to cultivating and weed control, control watering, and avoid flood irrigation.

3. Control locusts in time before and after emergence, mu 40% dimethoate 100 ml or 5% phlegm stop 40 ml, watered 30-40 kg uniform spray.

4. In the initial stage of disease, spray 1.5% of Shiyingling II emulsion 1000 times or 20% of virus A wettable powder 500 times.

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