First of all, to ensure that the soil does not contain pathogens, the following treatments can be carried out: First, change the soil or fully rotate in the field; Second, strengthen management to ensure good growth conditions. If soil treatment is required, the soil should be disinfected once a year, mainly using steam, soaking, or using chemicals. Which method is used depends on temperature, duration of use, and concentration.
The steam method is used to sterilize soil with a depth of 25cm to 30cm at 80°C for at least 1 hour. The effect of weak pressure steam is better than that of strong steam. Steam sterilization can prevent other diseases than pyocyanosis. Steam disinfection is supplemented by the application of special bactericides, which have a better sterilization effect. However, for sludge with low pH, steam causes excessive manganese in the harmful substances. Only adding appropriate amount of lime to adjust the pH or short-term steam can limit the manganese content to the standard value.
Immersion method in the greenhouse to use this method to disinfect the soil, the first step, in May sowing the crops such as two-color planting; the second step, in mid-June, when the plant is about 50 cm high, the soil plow deep in 20 cm Then, 100 kg of calcium nitrate was applied per 1,000 square meters of soil. At the end of July, after forming a crucible with a width of 60 cm to 70 cm, water and cover the membrane. After 2 weeks to 3 weeks, the soil was treated with a rotary cultivator and checked for pH and electrolyte concentrations.
Chemical Methods If conditions allow, use fungicides and chemicals to disinfect the soil. With this method, it should be performed at a soil temperature of not less than 10°C to 12°C and then covered with a film. After 3 days of warm weather and 7 days to 10 days of cold weather, the film is removed.
Other methods Pythium has a high ability to regenerate, so it is not enough to carry out ordinary soil treatment once a year. In order to control the growth of fungi, fungicides should be used to prevent infection before each planting. To spread evenly, mix the wettable powder with the sand, then spread it by hand, or spray it with warm water with a mouthful of watering cans. The effect can reach 15 cm to 20 cm below the soil surface. It is necessary to mix the fungicide and the soil manually or using a rotary cultivator.
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