Pumpkin Decline: Wet Leaves, Stem Cracking, and Cucumber Spread

Overhead Watering Triggered Disease

Sprinkler irrigation wet the foliage daily, creating perfect conditions for foliar diseases (powdery mildew, anthracnose, etc.) that spread to the cucumbers.

Rescue Plan for This Year

• Switch to drip irrigation or soaker hoses immediately.
• Apply Daconil (chlorothalonil) as a broad-spectrum protectant on remaining healthy foliage.
• Remove and destroy severely affected leaves.

Next Season

• Soil test before planting (free via Extension).
• Use drip from day one.
• Apply preventative fungicide at first true leaf.

The main stem cracking is likely advanced disease—prognosis is poor, but you may save the cucumbers.