The celery virus disease, also known as mosaic disease, has been cultivated in protected areas in recent years. Vegetable farmers should pay attention to prevention and control.
First, the symptoms
Viral diseases mainly harm celery leaves. From the seedling stage to the adult stage, the disease can be affected. The incidence of the disease at the seedling stage and early growth stage is heavy. The incidence of seedling stage, the performance of mosaic leaf shrinkage deformity. Plants with severe disease are severely dwarfed and even die. In the early stages of the onset of the disease, young and delicate leaves first show mottled and then develop into mosaics, the diseased leaves become smaller, often shrinking and distorting, some mesophylls are degraded, the leaves become narrow and long, and they are chicken-like and petiole-stricken. Dwarf plants. The late-onset adult plants showed only yellow and green mosaic leaves on the new leaves, and the growth of the transplanted plants was almost normal.
Second, the incidence of the law
Viruses like high-temperature and drought conditions, suitable for the onset of the temperature range of 15 °C -38 °C, the optimal temperature for the onset of the environment 20 °C -35 °C, relative humidity less than 80%. Serious locust occurrence, when the growth of celery is poor, the viral disease is serious.
Third, control methods
1. Cockroach disease prevention. Debris is the key to preventing the spread of viral diseases. From the time of emergence and harvesting during the entire period of birth, we must do a good job of annihilation, and it is especially important to eradicate larvae at the seedling stage.
2. Strengthen field cultivation management. Timely sowing, reasonable dense planting, adequate organic basal fertilizer, strengthening fertilizer and water management, promote plant robustness, and increase disease resistance. During agricultural operations, hands and farm tools that have contacted infected plants should be washed with soapy water to prevent infection. Protected areas use insect nets to cover insects outside the shed.
3. Chemical control. Beginning at the onset of the disease in the field, optional 20% morpholinium hydrochloride wettable powder (virus A) 500-600 times, 1.5% phytopathogenic emulsion 1000 times, 0.1% zinc sulfate solution or 15% virus must Gram sprayable 700-1000 times spray, spray once every 7-10 days, continuous spray control 2-3 times, can reduce infection, play a preventive role.
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