This autumn rainy green onions prevent rot
Recently, many vegetable farmers telephoned and reported that many green onions (commonly known as “spin onionsâ€) no longer grow. The tips of the leaves are dry and yellow, and the ridges and soil have been removed. The onion roots have been found to be completely rotten. The author believes that the rot of the green onion root tissue is black, and the onion is infected with root rot.
Heavy scorpion is the key factor causing root rot of green onions. Because of continuous cultivation for many years, the number of pathogenic bacteria in the soil has increased, and diseases caused by heavy smashing are unavoidable, and it is very easy to cause rot of green onion roots. Affected by continuous overcast and rainy weather in the early period, the soil moisture is too large in recent days, and the air permeability is reduced, which affects the normal breathing in the roots, and the resistance of the plant itself declines. If the soil is cultivated at this time, resulting in a large number of wounds, pathogens can be used organically, which intensifies the occurrence of diseases.
For the prevention and treatment of root rot of green onions, the author believes that since the green onions are buried deep after cultivating green onions, the roots will be irrigated after the onset of the disease, and the effect is not satisfactory. Therefore, the prevention of early rot is the key.
Before cultivating soil with green onions, biofungus can be applied along with water, such as Ruishen, Feitiansheng, etc., to increase the soil beneficial bacteria and inhibit the infection of pathogens; or to use 58% of metalaxyl manganese zinc 600 to 800 times or 70% of the Cymoxan manganese zinc zinc 800 ~ 1000 times Irrigation; or in the trench soil bacteria poisoning net (enexone + hymexazol), an average of 5 to 6 pounds of land, and then earth. After earth-cultivation, if a diseased plant is found, it is necessary to promptly break the ridge and apply 72% Prec 800 times liquid + 96% hymexazol 3000 times liquid + rooting agent.
In rainy days, it is necessary to pay attention to the drainage of large fields, to avoid the rooting of water and to induce root rot. For pests such as cockroach and green onion, insecticides such as phoxim particles and chlorpyrifos can be used for control. The land that has been planted with green onions for many years should be rotated with other crops, but it cannot be rotated with the garlic and leeks of Liliaceae.
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