The following are the formulas of several different types of fungicides and their application scenarios, which are sorted and sorted according to authority and timeliness:
1. Industrial water treatment fungicides
Isothiazolinone fungicides
Formula: Active ingredient ≥ 1.5%, the main ingredients are isothiazolinone and synergist, the appearance is light green or light yellow transparent liquid, density 1.0-1.1 g/cm³ (20℃), pH value 2.0-5.0 (1% aqueous solution).
Application: Suitable for industrial circulating cooling water, wastewater treatment, swimming pool disinfection, etc., with broad-spectrum bactericidal and algaecidal effects.
Potassium ferrate fungicide
Formula: Potassium permanganate 20%, concentrated hydrochloric acid 60%, KOH 14%, ferric nitrate 5%, chlorine 1%.
Preparation method: KClO solution is generated by reaction in a chlorine generator, and then purified and dried after adding ferric nitrate. The final product is dark red crystals, which are easily soluble in water. A concentration of 6 mg/L can kill 99.9% of Escherichia coli.
Features: Strong oxidizing property, suitable for a wide range of pH values, and a sterilization rate of more than 99.95% for Staphylococcus aureus.
2. Agricultural compound fungicide (authoritative formula recommendation)
Classic broad-spectrum fungicide
Methyl thiophanate: Control fungal diseases such as anthrax and gray mold, suitable for cereals and fruit crops.
Chlorobromoisocyanuric acid: 50% concentration can kill fungi, bacteria and viruses at the same time, such as watermelon wilt (add water to the roots).
Fenfenconazole: Broad-spectrum systemic fungicide, control pear black spot, tomato drought blight, etc.
Special formula for diseases
Downy mildew: 40% cypermethrin·cyathiapiprolin suspension (grapes, vegetables).
Anthracnose: 25% prochloraz EC + 50% cyprodinil suspension (vegetables, fruit trees).
Root rot: 5% myclobutanil + 15% ethyl allicin WP for root application.
3. Homemade sterilizing water (plant care)
Chili water: Boil red peppers in water and dilute and spray to prevent red spiders and aphids. Acidic water should be used with caution.
Garlic water: Crush garlic, soak and filter, to repel insects and prevent powdery mildew. Spray continuously for 3-4 times.
Wood ash water: Soak wood ash and take the supernatant, apply to diseased leaves or spray to prevent aphids and snails.
Precautions
Industrial formulas require professional operation, such as the preparation of potassium ferrate, which involves strong acid and chlorine.
Pesticide compounding must strictly follow the concentration to avoid pesticide damage (e.g., propiconazole is prohibited for watermelon seedlings).
Homemade requires testing plant tolerance and avoiding frequent use of acidic solutions.
