Late blight

potato blight

late blight
late blight

CLASSIFICATION

Chromista, Peronosporea, Peronosporaceae, Phytophthora, Phytophthora infestans

ABOUT

Late blight is caused by the pathogen Phytophthora infestans, often occurring in tomatoes and potatoes. Typical symptoms are water-soaked gray-green spots on older leaves, large brown blotches on leaves, dry brown foliage, and dark brown spots on fruits.

How to treat?

  • microscopeBiological

    • If possible remove and destroy the infected plant. Burn it, toss it into the garbage, or bury it deeply. Do not compost.

  • syringeDisease prevention

    • Use resistant species and cultivars as well as healthy, certified seeds and seedlings.

    • Rotate crops. Avoid planting sensitive crops in Phytophthora infested soil.

    • If necessary, use chemical products as a prevention (e.g. copper-based spray, phosphonates). These chemicals may lead to the development of resistant strains.

    • Disinfect tools, infected flower pots, and hands to avoid disease transmission.

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