Buck-eye rot

Phytophthora parasitica

Buckeye rot of tomato affects tomato plants, although there are many other plants that are affected, including pepper, potato, tobacco, pineapple, and various other hosts. Upon infection, brown and greyish-green water soaked spots appear on the fruit. These spots develop into lesions that resemble the markings of a bull's eye with alternating dark and light brown concentric rings. These are very smooth lesions, barely raised, unlike the rough lesions found in late blight (Phytophthora infestans), which is a similar pathogen. Finally, a white fungal-like growth may appear within the lesion. While fruit rot is the most common symptom, damping off and stem cankers are possible. The disease does not affect the foliage of the plant, which further helps separate it from late blight.

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