What are the commonly used varieties of flower fungicides?
What are the more commonly used flower fungicides.
What are the more commonly used flower fungicides.
Triadimefon has preventive, eradicant and fumigant effects on rust and powdery mildew. It can control apple rust, Populus tomentosa rust, chrysanthemum rust, sedge rust, rose rust, rose powdery mildew, crabapple powdery mildew, cineraria powdery mildew, ivy powdery mildew, etc. For example, when spraying with 25% triadimefon wettable powder, the usual concentration is a 3000-4000 fold dilution; when spraying with 20% triadimefon emulsifiable concentrate, the usual concentration is a 2000 fold dilution. In addition, triadimefon also has a certain control effect on leaf blight, brown spot and leaf spot of flowers.
Chlorothalonil has a preventive effect on many plant diseases. Chlorothalonil has good adhesion on plant surfaces and is not easily washed off by rain, so it has a relatively long effective period, generally 10 days. However, it has no systemic conductive effect and will not be absorbed from the sprayed parts or root system, so spraying should be uniform and thorough. Usually, spraying with a 600-1000 fold dilution of 75% chlorothalonil wettable powder can effectively control rose black spot, poplar black spot, chrysanthemum brown spot, peony brown spot, rubber tree anthracnose, clivia anthracnose, cherry brown spot shot hole disease, etc. Chlorothalonil is somewhat irritating to human skin and eyes, so corresponding protective measures should be taken during use.
Xiaojunling: Xiaojunling can not only prevent and kill bacteria, but also has a strong ability to kill viruses. In addition, because the raw materials for production are urea and potassium salt, it also promotes plant growth. Spraying with a 1000-2000 fold dilution of 50% Xiaojunling wettable powder can effectively control rose black spot, rose powdery mildew, rose branch blight, rose gray mold, rose crown gall, tulip blight, lily leaf blight, chrysanthemum mosaic disease, salvia mosaic disease, turf brown patch, turf stem rot, as well as various root rots and stem rots.
1. Chlorothalonil: It has protective and therapeutic effects, a broad bactericidal range, and a long residual effect period, and is irritating to the skin and mucous membranes. A 600-1000 fold dilution of commonly used 75% chlorothalonil wettable powder is sprayed to control rust, downy mildew, powdery mildew, black spot, anthracnose, blight and other diseases. A 40% powder can also be used for dusting, with an application rate of 3-4 grams per square meter. It cannot be mixed with strongly alkaline pesticides, and is prone to causing phytotoxicity to pear, persimmon, plum, etc.
2. Carbendazim: It is a highly effective, low-toxicity, broad-spectrum systemic fungicide with protective and therapeutic effects and a long residual effect period. Generally, a 1000-1500 fold dilution of 50% wettable powder is sprayed to control brown spot, sclerotinia rot, anthracnose, powdery mildew and other diseases. It can also be used for seed dressing and soil disinfection. When dressing seeds, the dosage is generally 2-3/1000 of the seed weight.
3. Bordeaux mixture: It is a good protective fungicide, prepared from copper sulfate, quicklime and water. According to the different amounts of copper sulfate and quicklime used, it can be divided into equal amount formula (1:1), half amount formula (1:0.5), high amount formula (1:3) and double amount formula (1:2), among others. When preparing, first use half of the water separately to dissolve the copper sulfate and quicklime, then pour the copper sulfate into the quicklime solution, and stir evenly with a stick. The prepared Bordeaux mixture is a sky-blue colloidal suspension, alkaline, with strong adhesion, and can form a film on plant surfaces, with an effective period of about half a month. Bordeaux mixture does not store well and must be prepared and used on the spot, and cannot be mixed with pesticides that are incompatible with alkali. It can control black spot? rust, downy mildew, gray spot and many other diseases.
4. Lime sulfur mixture: It is also a protective fungicide, made by boiling quicklime, sulfur powder and water in a ratio of 1:2:10. The stock solution is a dark reddish-brown transparent liquid with a rotten egg smell and is alkaline. When preparing, first boil the water in a pot, pour in 1 part quicklime, and after the lime dissolves, add 2 parts sulfur powder that has first been mixed into a paste with a small amount of water, stirring while adding. After adding, boil over high heat for about 1 hour, and when the liquid turns reddish-brown, stop the fire. After cooling, filter out the sediment, and this is the lime sulfur mixture stock solution, whose Baume degree is generally 20-24. The stock solution must be diluted before use. For spraying during the dormant period, Baume 3-5 degrees can be used, while during the growing period only a dilution of Baume 0.3-0.5 degrees can be used. It can control powdery mildew, rust, downy mildew, shot hole disease, leaf spot and many other diseases, and can also control pests such as whiteflies, spider mites and scale insects.
5. Thiophanate: It is a highly effective, low-toxicity, broad-spectrum systemic fungicide with protective and therapeutic effects and a long residual effect period. Its bactericidal range and efficacy are similar to carbendazim, with low toxicity to humans and livestock and safety for plants. A 500-1000 fold dilution of commonly used 50% wettable powder is sprayed to control powdery mildew, anthracnose, sooty mold, southern blight, sclerotinia rot, leaf spot, gray mold, black spot and other diseases. Thiophanate-methyl is also commonly used.
6. Zineb: It is a broad-spectrum organic sulfur fungicide, light yellow, with a slight odor, and extremely easy to decompose in air or sunlight. A 400-600 fold dilution of commonly used 65% wettable powder is sprayed to control brown spot, anthracnose, damping-off, shot hole disease, gray mold, powdery mildew, rust, leaf blight, seedling blight, etc. It cannot be mixed with alkaline agents or agents containing copper or mercury.
7. Tuzet: It is a mixed fungicide of organic arsenic and organic phosphorus, a white powder, difficult to dissolve in water, easily soluble in alkaline solutions, and easily decomposes in acidic, high-temperature and humid environments. Generally, a 1000-1500 fold dilution of 50% wettable powder, or a 2000-2500 fold dilution of 80% wettable powder, is sprayed to control anthracnose, rust, seedling blight, powdery mildew, sclerotinia rot and other diseases.
8. Benlate: It is a broad-spectrum systemic fungicide with both protective and therapeutic effects. It is insoluble in water, has a slight irritating odor, and has a long effective period. A 2000-5000 fold dilution of commonly used 50% wettable powder is sprayed to control gray mold, anthracnose, powdery mildew, sclerotinia rot and other diseases.
9. Amobam: It has strong bactericidal power and both protective and therapeutic effects. After decomposition, it also has a certain fertilizing effect. It is a light yellow liquid. A 1000 fold dilution is commonly sprayed to control powdery mildew, downy mildew and leaf spot. A 200-400 fold dilution can also be used to drench soil to control seedling blight.
10. Sulfur powder: It is a yellow powder with an obvious odor and has bactericidal and insecticidal effects. The effective period is 5-7 days. A 50% powder is commonly used for dusting, with an application rate of 1-3 grams per square meter, or used for fumigation, with an application rate of 1 gram per square meter, and can control powdery mildew.
11. Streptomycin: It is a white powder. Generally, a concentration of 100-200 milligrams per liter is sprayed, used as a root drench or injected to control bacterial diseases, downy mildew, etc.