What are the harmful effects of excessive use of tebuconazole on wheat (will excessive use cause phytotoxicity)?

Effects of Tebuconazole on Wheat

Tebuconazole belongs to the triazole fungicide class. This type of fungicide has a common characteristic: improper use can easily cause phytotoxicity.

However, the advantages of this type of fungicide are so obvious that some people ignore its disadvantages. This type of agent has a broad spectrum of fungicides, outstanding effects, and strong systemic and fumigation effects. It also has three functions: protection, treatment, and eradication. Although tebuconazole has a good effect, it has a certain control effect, so it is not recommended to use it in the seedling stage.

Our commonly used compound products include tebuconazole•myclobutanil for controlling wheat ergot, cyfluthrin•tebuconazole for controlling wheat rust, tebuconazole•myclobutanil for controlling apple brown spot, etc.

The single agent of tebuconazole is also effective and can be used to control rust, powdery mildew, web spot, root rot and wheat mildew on a variety of crops. It can also control peanut brown spot, brown ring spot, grape gray mold, powdery mildew, banana leaf spot and tea cake disease, etc.

The bactericidal characteristics of tebuconazole are that after use, it is conducted from the wheat body to the top, killing internal pathogens, and promoting growth and increasing the number of effective tillers. It can effectively prevent powdery mildew, fusarium head blight, leaf spot on peanuts, and sheath blight on rice.

What are the effects of excessive use of hexaconazole on wheat?

Tebuconazole is a suitable drug for preventing and controlling wheat fusarium wilt. Generally, 12 to 16 grams of pure drug is used per acre. If the dosage is too low, the prevention effect cannot be guaranteed.

If the dosage is too large or the concentration is too high, or if there is a sharp drop in temperature in a short period of time after application, wheat growth may be overly inhibited.

According to relevant information, when the temperature is above 20℃, 20~30g of 43% tebuconazole can be used per mu; when the temperature is below 15℃ or lower, 10~15g of 43% tebuconazole can be used per mu. Excessive use of the drug or application before a strong drop in temperature can easily cause phytotoxicity to wheat, and even affect flowering and pollination, leading to difficulty in heading and poor fruiting. Therefore, in production, a mixture of tebuconazole is often used to control fusarium head blight to reduce the risk of phytotoxicity to wheat.

Method of applying tebuconazole to wheat

For the first spray, we can spray the wheat from the time it sprouts to the time it joints. In addition to preventing insects and diseases, it can also prevent lodging and increase the number of effective ears.

Specific formula: Farmers are advised to choose imidacloprid + cypermethrin + propiconazole + pyraclostrobin + brassinolide + potassium dihydrogen phosphate.

The second application of medicine should be used during the grain filling period. In addition to killing insects and bacteria, it can also resist dry hot winds and increase thousand-grain weight.

Specific formula: high chlorine thiamethoxam + diazinon + propiconazole + pyraclostrobin + brassinolide + potassium dihydrogen phosphate.

If you want to specifically prevent and treat ergot disease, you can replace pyraclostrobin with tebuconazole, the effect will be better!