One is after the rain row out. After the onset of heavy rainfall in the lush green field, we must promptly drain the water from the fields to prevent the roots from being exposed to rain for a long time.
The second is cultivator planning. After heavy rain, the soil tends to show consolidation and the degree of soil salinization increases, and the metabolic activity of welsh onion roots weakens. For this reason, the cultivator must be ploughed in time after the rain to increase the permeability of the topsoil of the soil and help to promote the root system to resume growth as soon as possible.
The third is pest control. At present, it is the high incidence period of pests such as onion thrips, leaf miners, and root locusts. They often damage the leaves or roots, causing the rapid spread of the disease. Therefore, the pesticide should be sprayed in a timely manner. The onion thrips can be controlled by 2.5% of highly effective cypermethrin 2000 times spray. The leaf miner can be controlled by spraying 10% of imidacloprid 1000 times, and 50% of phoxim can be used for root cane. Liquid irrigation root prevention and treatment.
The fourth is early spraying control. In the early stage of onion soft rot, 72% agricultural streptomycin sulfate 4000 times or 77% copper hydroxide wettable powder 500 times solution can be used for spraying. Alternating use of drugs 2 to 3 times can play a significant control effect.
For plots with severe onion soft rot, the diseased plants should be taken out of the field for burning or deep-buried treatment. Laminated lime should be sprayed around the diseased hole to prevent the spread of the disease.
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