Fungicide Mixing and Application Guidelines

Improper mixing of pesticides can cause phytotoxicity. Here’s a summary of several fungicides, including copper-based products, azoxystrobin, tebuconazole, propiconazole, bromochloroisocyanuric acid, pyrimethanil, fluazinam, cymoxanil, thiram, and flutriafol. These guidelines focus on usage and mixing restrictions to help you avoid crop damage.

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1. Copper-Based Products

• Avoid Fungicide mixing with alkaline pesticides: Copper products are generally acidic and can react with alkaline pesticides, reducing efficacy or causing damage. Do not mix with lime sulfur or Bordeaux mixture.
• Use with caution in high heat and humidity: Copper-based products can cause crop damage under these conditions, especially on sensitive crops like apples and grapes. High temperatures also increase the release of copper ions, raising phytotoxicity risks.
• Caution with copper-sensitive crops: Crops like peaches, plums, soybeans, and cabbage are sensitive to copper. Apply with care to avoid damage.
• Avoid continuous use: Prolonged use may lead to copper accumulation in soil, negatively impacting microbial communities and crop health.
• Mixing restrictions: Do not mix copper products with thiram, mancozeb, or other metal-based fungicides. Avoid mixing with strong acids or alkalis.

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2. Azoxystrobin

• Do not mix with emulsifiable concentrates (EC): Fungicide mixing with organosilicon or EC formulations can cause crop damage.
• Avoid in high heat and strong sunlight: These conditions may increase the risk of phytotoxicity and affect plant growth.
• Sensitivity with some crops: Crops like strawberries may be more sensitive to azoxystrobin. Conduct a small test before widespread use.
• Avoid strong alkaline pesticides: Mixing with such products can reduce azoxystrobin’s effectiveness.

3. Bromochloroisocyanuric Acid

• Avoid Fungicide mixing with organophosphates: This can produce toxic gases harmful to both humans and crops.
• Avoid use near aquatic farms: It is toxic to aquatic organisms and may harm nearby fisheries.
• Prepare fresh mixtures: The solution degrades quickly after mixing, so use it immediately to maintain efficacy.
• Follow dosage guidelines: Overuse can harm crops, so adhere strictly to recommended concentrations.

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4. Tebuconazole

• Caution during the seedling stage: It can inhibit growth during this stage, so avoid use on young plants.
• Avoid during flowering: Using tebuconazole during flowering can harm flowers and reduce fruit set.
• Rotate with other fungicides: Continuous use can lead to resistance. Alternate with other fungicides for effective disease control.
• Follow concentration guidelines: Overuse can lead to crop damage.

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5. Propiconazole

• Sensitive crops: Use cautiously on sensitive crops like cucurbits and legumes to avoid damage.
• Avoid in high temperatures: High temperatures can increase the risk of phytotoxicity.
• Avoid use during sensitive growth stages: Refrain from applying during seedling and flowering periods to prevent growth disruption.
• Do not mix with strong alkaline products: This reduces efficacy and can cause adverse reactions.

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6. Flutriafol

• Highly active, use with caution: Especially on beans and cruciferous vegetables, test before use.
• Avoid on cucurbits and grapes: Use cautiously, as these crops are more sensitive.
• Mixing restrictions: Do not mix with strong acids, alkalis, or certain insecticides like organophosphates.

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7. Thiram

• Avoid mixing with copper products: There should be a 10-15 day gap between applications to prevent damage, especially to pear trees.

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8. Pyrimethanil

• Use under specific conditions: Apply in environments with less than 65% humidity and temperatures below 28°C. Avoid high concentrations and closed environments.
• Sensitive crops: Use cautiously on legumes, eggplant, and cherries, especially in greenhouses.

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9. Fluazinam

• Do not mix with strong acids or alkalis: This reduces the effectiveness of the product.
• Avoid on sensitive crops: Cucurbits and grapes may be sensitive, so test before use.
• High temperature caution: Avoid applying in high temperatures or closed environments to prevent crop damage.

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10. Cymoxanil

• Cruciferous vegetables sensitivity: Be cautious when using on cruciferous vegetables, as they may be prone to damage.
• Mixing restrictions: Do not mix with bromochloroisocyanuric acid.