First, the symptoms of the disease first appeared in the base of the new leaf yellowish green mosaic mottled, yellow stripes or lengthened stripe, when severely covered with foliage, some leaves are flat and twisted. Another symptom is the yellowing of the leaves, followed by poor fertility, yellowing, dwarfing, and more thin leaves. Onion often begins to develop in the late stage of nursery. The diseased plants grow slowly, the leaves are flat, wavy, and there are mosaic symptoms or elongated maculas. The diseased plants are obviously short and small.
Second, the law of occurrence
The virus-mediated insects are aphids. High temperature and drought during the seedling stage, the winged otters migrated more, and there were nearby onion poisonous plants. The incidence was early and heavy. Early spring sowing disease is light, late sowing sick. Poisonous onion shoots and bulbs can also be transmitted.
Third, control methods
1. Do not raise seedlings near onion cultivation grounds or onion cultivation grounds. The spring seedlings should be properly sowed early. If aphids move during the breeding period, they should be covered with nylon or white plastic gauze on the seedbed. The diseased plants were removed during the nursery period and before the seedlings were transplanted, and insecticides were sprayed at the seedling stage to prevent flooding. Do not plant poisonous onion shoots and bulbs. Strengthen inspections to prevent the introduction of the virus into the disease-free zone from the affected area.
2, with 0.5% antitoxic agent No. 1 water 300 times, or 20% of the virus net 500 times, or 20% of the virus A WP 500 times, or 20% of the virus Buster 500 times, or 5% of the bacteria Water agent 500 times.
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