Intensive efforts to prevent and control spinach downy mildew
First, the symptoms
The main damage leaves. At the beginning of the lesion, there were pale green dots with indistinct edges. After expansion, the lesions were irregular and varied in size. They were 3 to 17 mm in diameter. When the humidity was high, the gray moldy layer appeared on the lesions on the back of the leaves and then turned grayish purple. The lesions spread upward from the lower part of the plant. During drought, the diseased leaves became yellow, and when the humidity was high, they were more rotten. The diseased leaves of the whole plant turned yellow and died, and some vegetable strains showed atrophy.
Second, transmission routes and conditions
The pathogens use hyphae to attack the host and seeds on the victim or oospores in the sick leaves for overwintering. The spores are produced in late spring and spread by airflow, rain, agricultural machinery, insects and agricultural operations. The spores germinate to produce germ tubes. Invade from the epidermis or stomata of the host, and then produce sporangia in the diseased part and reinfect in the field. Low-temperature and high-humidity, planting density is too large, and the incidence of water and early sowing is heavy.
Third, control methods
1. In serious wards, 2 to 3 years of rotation should be implemented to strengthen the cultivation and management, so that the density is appropriate, scientific irrigation, and reduce the humidity in the field.
2. At the beginning of the disease, spray 80% triethylaluminum phosphate 500 times, 64% antivirus WP 500 times, 58% metalaxyl MnZn 500 times, 72.2% plenicil 800 times, etc. One day spray, continuous control of 2 or 3 times, can effectively control the spread of downy mildew. When the heavy land masses are sprayed, the concentration of the liquid medicine may be appropriately increased, but not so much as to avoid causing phytotoxicity. At the same time, the combination of sprayed leaf fertilizer and plant growth regulators can be used for prevention and treatment, and the effect is better.
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