Tomato Late BlightIdentification & Treatment Guide 2026
Phytophthora infestans · Family: Peronosporaceae
Tomato late blight is caused by Phytophthora infestans. It creates water-soaked gray-green lesions that rapidly turn dark brown, with white mold on leaf undersides in humid conditions. It can destroy crops in days. Apply preventive copper or mancozeb sprays, destroy infected plants immediately, and use resistant varieties like Mountain Magic or Defiant.
Scan This Plant NowQuick Diagnosis
criticalTomato Late Blight
- Affects
- leavesstemsfruittubers
- Peak Season
- Cool wet weather (10-25°C with high humidity), late season in temperate zones, rainy season in tropics
- Spread Risk
- Fast
- Spread By
- Airborne sporangia carried by wind and rain, infected seed tubers, volunteer plants
আপনি কি মনে করেন আপনার গাছে Tomato Late Blight আছে?
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Symptoms: What does Tomato Late Blight look like?
Visual identification guide — tap each stage for details
Water-soaked pale green patches
Irregular, water-soaked, pale green to gray-green patches appear on leaf tips and edges. Lesions look greasy or wet.
Expanding dark lesions with white mold
Patches expand rapidly turning dark brown to purplish-black. White cottony sporulation visible on leaf undersides in humid mornings. Stems develop dark brown lesions.
Plant collapse and fruit rot
Entire plant wilts and collapses within days. Fruit develops firm, greasy-looking, irregular brown lesions. Fetid smell as secondary bacteria invade dead tissue.
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