Late Blight

Phytophthora infestans

Image of late blight
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Symptoms:
Lesions on leaves appear as large watersoaked areas, that eventually turn brown and papery. Fruit lesions are large irregular greenish-brown patches having a greasy rough appearance. Green to black irregular lesions are also present on the stems.

Control:
The fungus develops during periods of cool wet weather. Fungicide sprays as a preventative measure during these periods may be needed if the crop is being grown near large areas of tomato relatives (Solanaceous weeds, potatoes).

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Publication Revised December 2008