Apply Fungicides When Needed

Treat plants with an appropriate fungicide when disease pressure is high or at the first sign of fungal infection. Organic options include copper-based sprays, sulfur dust, and neem oil. Synthetic fungicides such as chlorothalonil are also available for home gardens. Always identify the disease before selecting a product and follow label directions for mixing rates, timing, and pre-harvest intervals.

Why It Works

Fungicides either kill fungal spores on contact or create a protective barrier on leaf surfaces that prevents spore germination. Applied preventatively or at early onset, they stop diseases like early blight, late blight, and powdery mildew from spreading through the crop.

Tips

• Apply in calm, dry conditions for best coverage and to prevent drift
• Rotate fungicide classes to reduce the risk of pathogen resistance
• Copper sprays can accumulate in soil over time, so use the lowest effective rate
• Combine fungicide use with cultural practices rather than relying on sprays alone