For the sterilization of the seedbed soil, the fungicide should be selected according to the occurrence of local cotton diseases and the prevention and control. The cotton seedbed soil is strictly disinfected and sterilized before sowing. Only in this way can the disease be effectively prevented from becoming epidemic.
In general, the treatment of cotton seedbed soil with fungicides is mainly aimed at controlling cotton mites, blight, anthracnose, blight and verticillium. The fungicides commonly used in the soil treatment of cotton seedbeds are carbendazim, dipyridamole (dikesone), and carbendazim. Copper amide, pentachloronitrobenzene, bactericidal acid, thiophanate-methyl, carbendazim, thiram, chlorfenapyr, strong chlorin, fu-fu zinc (including thiram, fumei zinc), Fu· Mixing (including Fumeishuang, mixed seedlings) and other chemicals can be used for seed dressing and cotton seedling spraying, and can also receive better soil disinfection effects. The following highlights the following:
Cotton tampon is a broad-spectrum nematicide that also has a role in the treatment of fungi, underground pests and weeds in the soil. The pesticide is easy to spread in the soil, has good control effect on nematodes, and has a long-lasting effect, and can be mixed with fertilizers, mainly showing fumigation. When used, the soil temperature should be kept above 6 °C (12~18 °C is the most suitable), and the water content should be kept above 40%. This medicine has phytotoxicity to all green plants and cannot be exposed to crops when soil is treated.
Jingtuling (0.5% amino oligosaccharide liquid) This medicine is a fungicide extracted from microbial metabolites, which has an inhibitory effect on the growth of some pathogens, such as affecting the spore germination of fungi, causing the morphology of mycelium to mutate. The intracellular biochemical reaction of silk is changed. It can be used for the disinfection treatment of seedbed soil and the spraying after seedling, which can effectively control various diseases such as cotton verticillium wilt. The drug also induces plants to produce antibacterial substances and stimulates the growth of crops such as cotton seedlings.
Allicin, also known as antibacterial agent 402, is a broad-spectrum fungicide. It is used for cotton seed dressing or spray irrigation root sterilization and has good control effect on cotton blight, verticillium wilt and blight. Allicin has a stimulating effect on crop growth, and the seed treated by it has a quick emergence and the cotton seedling grows robustly.
The drug is stopped by the iodine plus auxiliaries extracted from kelp. According to the China Pesticide Network , it has a wide spectrum of sterilization, and it has good effects on various diseases caused by fungi, bacteria or viruses. It can be used for long-term use without drug resistance, and can control cotton wilt, verticillium wilt and blight. ,anthrax. The sterilization mechanism of the drug is unique, the sterilization speed is only a few seconds, because it is a negatively charged fungicide, which itself has the characteristics of strong permeability, and the bacteria are generally positively charged, generally fungi only It takes 7 seconds, the bacteria 3 to 4 seconds, and the virus can kill in 10 seconds. For the control of cotton seedling diseases, 1000~1500 times of dilution liquid can be used to irrigate the seedbed soil, and the sterilization effect is good.
The noble copper (27.12% basic copper sulfate suspension) has the same bactericidal action as the Bordeaux mixture. The separated copper ions produce bactericidal action, and the bactericidal spectrum is wide, and the bacteria are not easy to produce drug resistance. It has good control effects on cotton blight, anthracnose, stagnation, blight and verticillium. The high-grade copper is a new dosage form with fine drug particles and good dispersibility in water. After spraying, the drug is evenly distributed on the cotton seedlings, which overcomes the disadvantages of the Bordeaux mixture being susceptible to phytotoxicity when used under high temperature and high humidity conditions. It is worth promoting in cotton seedbeds. It can be sprayed once before or after emergence, and transplanted with copper high-grade spray cotton sputum before transplanting. At the same time, spray the medicine on the transplanting point and surrounding soil to prevent the bacteria from invading from the root.
Rice foot green is mainly used for controlling anthracnose and blight of cotton seedlings. Mainly do a good job of disinfection and sterilization of nutrient and cover soil. The pesticide network recommends that 20% rice amphibious wettable powder be prepared into 0.3%~0.4% liquid medicine, the nutrient soil is wetted, and the cover soil is spray-sterilized with the same concentration of liquid medicine.
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