Chlorothalonil is a fungicide commonly used during crop cultivation, and it plays a very good role in controlling various diseases. However, with the widespread use of chlorothalonil, various problems have emerged. Therefore, it is necessary to understand the correct use of chlorothalonil. The following small series will lead everyone to learn about the use of chlorothalonil and points of attention, as follows:
How to use chlorothalonil
1. Prevention and control of rice blast disease When leaf lice are seen, the field begins to spray the medicine and sprays once every 7 days. Control the ear mites, spray each time in the rice break period and the heading stage. Use 75% chlorothalonil WP 1500-1900 g (active ingredient 1125 ~ 1425 g) per hectare, add 1050 liters of water, stir evenly.
2. Prevention and control of rice sheath blight in the early stage of disease or in the period from the ear to the booting stage to the booting stage, spray the drug after 7 days, and use 75% chlorothalonil WP 1500-1900 per hectare. Gram (active ingredient 1125 ~ 1425 grams), add water 1050 liters, stir evenly spray, focus on spraying rice stems.
3. Prevention and control of wheat leaf rust and leaf spot disease At the beginning of the disease, spraying is started, spraying once every 7 days, spraying 2 to 3 times continuously, and using 75% chlorothalonil WP for each hectare. 1500 ~ 1900 grams (effect composition 1125 ~ 1425 grams), add 1050 liters of water, stir evenly sprayed.
4, flower rust disease, brown spot disease, black spot disease prevention and treatment in the early stage of the disease began spraying, spraying every 7 to 10 days, continuous spraying
2 to 3 times. Depending on the growth period and disease development of peanuts, it is decided whether to apply the medicine. Use 75% chlorothalonil wettable powder per hectare 1500 ~ 1800g (active ingredient 1125 ~ 1350g), or 40% Dakoning suspending agent commercial volume 1500 ~ 2250g (active ingredient 600 ~ 900g ), add 900 liters of water and stir evenly.
5, the prevention and treatment of cucumber downy mildew before the disease occurs or in the beginning of spraying, spraying once every 7 days. Continuous spraying 3 to 4 times, each time using 75% chlorothalonil wettable powder, 2200~4000 grams (active ingredient 1650~3000 grams), or 40% Dakoning suspension or 40% bacteria The amount of detergent agent is 2250~2625g (active ingredient 900~1050g), add 1125 liters of water, stir evenly spray, and reduce the amount of spray of cucumber seedlings. The prevention and control of cucumber downy mildew in greenhouse can be controlled by chlorothalonil smoker. In the early stage of disease, the smoke is smoked and fumigation, and the amount of 10% chlorothalonil in each greenhouse is 7500~12000g, or 20%. The amount of smoke cleaner is 3,750 to 6000 grams, or
30% chlorothalonil smoked product volume of 2500 ~ 4000 grams, or 45% chlorothalonil smoked product volume of 1667 ~ 2667 grams (active ingredients 750 ~ 1200 grams) ignited fumigation. It is also possible to use 5% chlorothalonil powder with a commercial quantity of 15,000 to 22,500 g (active ingredient 750 to 1125 g) to prevent and control the development of the disease.
6. Prevention and treatment of tomato early blight begins spraying at the beginning of the disease, spraying once every 7 to 10 days, spraying 3 to 4 times in a row, using 75% chlorothalonil or Dakeling wettability per hectare. Powder product volume 2200 ~ 4000 grams (active ingredient 1650 ~ 3000 grams), or 40% chlorothalonil suspension agent commercial volume 2250 ~ 2625 grams (active ingredient 900 ~ 1050 grams) plus water 1125 open, stir even spray, seedling hour spray The amount is reduced.
7. Prevention and treatment of black spot and downy mildew in cabbage In the early stage of disease, climatic conditions are favorable for spraying when the disease occurs, spraying once every 7 to 10 days, spraying 2 to 3 times continuously, each time For hectares, use 75% chlorothalonil wettable powder, the commercial quantity is 1700-2300 g (active ingredient 1275~1725 g), add 900 liters of water, stir and spray evenly.
Note on the use of chlorothalonil
1, Apple: Xiehua within 20 days of young fruit should not be used, easy to produce phytotoxicity, some yellow apple varieties, especially Jinshuai variety, will produce rust after treatment;
2, pear tree: can not spray, otherwise produce phytotoxicity;
3, peach tree: can be used after the flower bud period and Xiehua, used carefully in the young fruit period, will produce rust spots when the concentration is high;
4. Grapes: There are phytotoxicity to red and green fruit, and some yellow varieties have phytotoxicity, which will produce rust fruit. The problem of using after bagging is not big; Jufeng series needs to be tested and verified!!!
5. Flowers: It is easy to cause phytotoxicity to plum blossoms and roses;
6. It is easy to cause phytotoxicity on the peach tree mixed with the killing pine; it is prone to phytotoxicity on the tea tree mixed with the Ketite and the tricyclic tin;
7. Persimmon and plum are sensitive to chlorothalonil and cannot be used;
8. Chlorothalonil is also highly toxic to fish and bees. Therefore, chlorothalonil should be used cautiously in paddy fields and should not be used before and after the flowering period of crops;
9. Oily substances may aggravate phytotoxicity. It is not advisable to add oil auxiliaries when mixing liquids. Be careful when mixing with emulsifiable concentrates;
10. A large number of studies have found that after long-term intake of high doses of chlorothalonil in rats and mice, there will be renal hyperplasia and renal epithelial tumors, indicating that chlorothalonil still has certain toxicity risks to humans. Therefore, chlorothalonil should not be used at high doses on the eve of crop harvesting (within 7 days).
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