Pyrimethanil is a member of the anilinopyrimidine class of fungicides, known for its effectiveness against gray mold. Once applied, it can quickly penetrate plant tissues, reaching areas that are difficult to spray, such as flowers and young fruits, where it effectively kills pathogens. Its performance is not significantly affected by temperature, making it a suitable option for use in cooler conditions, with continued strong control over gray mold.
However, improper use of pyrimethanil can lead to phytotoxicity, particularly in eggplants. Symptoms include dark brown spots on leaves, which may appear irregular or cause yellowing and leaf drop. Many farmers mistakenly identify this damage as "spotted leaf drop disease" and may apply more pesticide, worsening the condition. Therefore, it's crucial to differentiate between phytotoxic symptoms and those caused by actual diseases.
The Pesticide Network provides guidance on recognizing and managing pyrimethanil-induced phytotoxicity. For crops like beans (including canola, cowpea, and others), the effects of pyrimethanil can include severe yellowing, drying, brown spots, and even leaf and flower drop. While these plants are sensitive, the pesticide is still usable when applied correctly.
To ensure safe application, the concentration of active ingredient should not exceed 6 grams per mu (approximately 0.4 acres). For example, a 40% suspension containing 15% pyrimethanil should be used at a rate of no more than 40 grams per acre on beans and eggplants.
The Pesticide Information Network advises that if phytotoxicity occurs, farmers can spray a mixture of 2-3 grams of 0.136% chelated zinc + indole-3-butyric acid + brassinosteroid powder (WP) per pot of water. This helps replenish gibberellins in the affected plants. Zinc promotes auxin synthesis, which supports photosynthesis and enhances the plant’s ability to withstand stress. These measures can help alleviate the damage and improve overall plant resilience.
Always follow label instructions carefully and consider environmental conditions before applying any pesticide. Regular monitoring of crops after treatment is essential to detect early signs of toxicity and take corrective actions promptly.
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