The method is to clean up the countryside and then close it to smoke(plastic gallon pots). 45% chlorothalonil fumigant or 30% sukeling fumigant or mixture of chlorothalonil and sukeling can be used to control the diseases mainly caused by gray mold(6 cell propagation trays wholesale). Dosage per mu: 300-500g 30% sukeling fumigant, 200-250g 45% chlorothalonil fumigant, evenly placed, separately lit, and then closed for 2-3H.
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At 7:00 p.m., stack sawdust every 2m, spread a layer of sulfur powder after spreading, pour in a small amount of alcohol, light one by one, and exhaust smoke 24 hours later(5 gallon plastic planters). This method has good disinfection effect, easy to get materials and low cost(8 cell propagation trays wholesale). It can also be sterilized with chlorothalonil and other fumigants, once every 7-10 days, more than three times in a row, with significant effect.(plastic greenhouse trays wholesale price chile)
Usage: spray 1% ~ 2% formalin solution evenly or wash it(plastic garden pots for sale), seal it and disinfect it on the ground, or disinfect it with dixone (concentration: 30mg / L). Disinfection of soil is one of the important measures to control soil borne diseases and insect pests, and consumers' pursuit of pollution-free agricultural products, green food and even organic food also put forward higher requirements for pesticide control(12 cell propagation trays wholesale).
Therefore, there are many methods of soil disinfection(big black plant pots). It is generally conducted from the first ten days of July to the last ten days of August(18 cell propagation trays wholesale). Under such conditions, the maximum ground temperature at 10cm below the ground surface can reach 70 ℃, and the ground temperature at 20cm depth can reach more than 45 ℃(36 cell propagation trays wholesale), so the high ground temperature sterilization rate can reach more than 80%.
(plastic greenhouse trays wholesale price chile)First, sulfur fumigation is used. Select a sunny day, use 4G of sulfur and 8g of sawdust per cubic meter of space(plastic starter pots). Most of the bacteria are not resistant to high temperature and can be killed after more than 10 days of heat treatment. Otherwise, the bacteria in the soil below will be turned up again to cause re pollution(40 cell propagation trays wholesale). At present, the following are mainly used. The dosage of fumigant is 0.2-0.3g per cubic meter of space.
For example, some Rhizoctonia solani, cucumber Sclerotinia, cucumber Phytophthora, Eggplant Verticillium wilt are not very resistant to high temperature(4.92inch plastic plant pots). Some pathogens are especially resistant to high temperature, such as root rot, root tumefaction and Fusarium wilt(50 cell seedling trays wholesale). The distribution of these deep-rooted soil borne pathogens is deep and must be treated for 30-50 days to achieve better results.(plastic greenhouse trays wholesale price chile)
Therefore, the time of soil disinfection should be determined according to the heat resistance of the crops and their corresponding pathogens(5.12inch plastic plant pots). However, the effect of high temperature closed shed is the best for the soil not more than 15cm deep, and the effect of disinfection is poor for the soil more than 20cm deep(51 cell propagation trays wholesale). Therefore, it is better not to plough again after the soil is disinfected, even if ploughing is limited to 10cm deep.