How to control onion yellow dwarf
Symptoms of the disease are the appearance of pale yellow-green patches of mottled leaves, yellow stripes, or streaks of varying lengths at the base of the new leaf. In severe cases, the leaves are covered with foliage and some blades 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.
Control methods: First, do not raise seedlings near onion cultivation or onion cultivation. 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.
The second is the use of 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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