Late Blight

Phytophthora infestans

late blight stem damage

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Lesions on stems appear as large watersoaked areas, green to black in color, that eventually turn brown and dry up. Lesions may be surrounded by a white ring of mold if leaf wetness is high.

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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