Pyrimethanil is a member of the anilinopyrimidine class of **fungicides** and is highly effective in controlling gray mold. Once applied, it can quickly reach areas of the plant that are difficult to spray, such as flowers and young fruits, where it effectively targets the pathogen. Its efficacy remains stable across a wide range of temperatures, making it particularly useful during cooler weather when other fungicides may be less effective.
However, improper use of pyrimethanil can lead to **phytotoxicity**, especially in eggplants. Symptoms include dark brown spots on leaves, which may appear irregularly or cause yellowing and leaf drop. Many farmers mistakenly identify these symptoms as "spotted leaf drop disease" and may apply more of the same product, worsening the damage. It’s crucial to differentiate between phytotoxicity caused by pyrimethanil and diseases caused by pathogens to avoid further harm.
The **Pesticide Network** provides guidance on how to manage pyrimethanil-related phytotoxicity and offers recovery strategies. For example, beans (such as canola, cowpeas, and others) may show severe yellowing, browning, and even leaf loss when exposed to high concentrations. Flowers and fruits may also fall prematurely.
While beans and eggplants are sensitive to pyrimethanil, this doesn’t mean the product should be avoided entirely. Instead, it must be used with caution and at the correct concentration. A safe dosage for beans and eggplants is no more than 6 grams of active ingredient per mu. For instance, if using a 40% pyrimethanil + iprodione suspension (which contains 15% pyrimethanil), the maximum recommended application rate is 40 grams per acre.
The **Pesticide Information Network** advises that in cases of phytotoxicity, farmers can mix 2–3 grams of 0.136% chlormequat chloride + indole-3-butyric acid + brassinosteroid water-dispersible powder (WP) with one pot of water, along with a foliar zinc fertilizer. This combination helps replenish gibberellins in affected plants, while zinc promotes auxin synthesis, enhancing photosynthesis and strengthening the plant’s resistance to stress. These measures can significantly reduce the effects of phytotoxicity and help crops recover more quickly.
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