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First, the symptoms of disease
From the seedling stage to the time after transplanting, the incidence of head damage was heavy. The early death of the vegetable strain resulted in chlorosis or translucency of the diseased leaf veins, ie, bright veins, and the posterior leaves were inlaid with dark green leaves or dark green leaves, resulting in leaf wrinkling. Shrinking and uneven, the leaf curled into a deformed shape or twisted to one side. The leaf blade was first brown and necrotic on the veins. There was a horizontal crack on the leaf surface. The leaf surface showed necrotic brown dots, or the strip cracks spread along the veins and caused veins to crack. . Severe dwarfing of the diseased plant, causing the heart to curl into a mass, the lower leaves become yellow and dead, or the head into a thin rod-shaped, or the main root becomes brown and short and less root, the last vegetable yellowing dead, plant strains infected; In addition to the symptoms, the hard flowers often shorten and contract into "brake-like" or short-necked pedicels, which vary in length and length, causing the seeds to be not strong or full.
Second, the incidence of the law
In the area where cruciferous vegetables are planted all year round, sensible vegetables and cruciferous weeds such as wild rape are important sources of this disease. It is transmitted by the peach aphid, cotton aphid, vegetable tube, or contact. In general, after autumn harvest mustard, cabbage, radish and other cruciferous seed plants are harvested, winged oysters migrate to cruciferous vegetables growing in the summer and canola, Wujibai, pakchoi, jasmine radish, radish, and spread the virus on the propagation, and then passed through the early-planting cruciferous autumn vegetables and autumn cruciferous vegetables, and continued throughout the year.
In general, early sowing and aphids occur in large quantities, and the incidence of high-temperature and drought in the seedling stage is heavy. Mustard seedlings are most susceptible to disease, generally five leaves before the susceptible period.
Third, control methods
1. Select high-quality, high-quality varieties: select the best varieties of antiviral diseases.
2, timely sowing: sowing at an average temperature of 20 ~ 25 °C, beneficial seedlings robust growth, nurturing strong seedlings.
3, to strengthen the seedling management: According to the weather, seedlings, pests in the first piece of real leaves grow and spray (drugs in the same field).
4. Control of Daejeon: 10% imidacloprid 20g plus 20% virus A wettable powder 100-150g watered 50Kg spray, or 10% imidacloprid 20g plus virus Bac water 50ml diluted with water 50Kg spray, or 10% imidacloprid 20 Gaga planting. 7--10 days after the application of 1 time, continuous control of 2 or 3 times.
Mustard virus disease is the main pest and disease that threatens the production of mustard. Recently, due to the influence of temperature, serious virus disease has occurred in the mustard planted in some townships in our county. The townships should strengthen the prevention and control of mustard virus disease and ensure the vegetable production in the county. Work properly.