Buckeye Rot — Tomato

Symptoms

Brown spots develop on green and ripe fruits, often near the blossom end. Lesions develop concentric rings of alternating dark- and light-brown bands. The fruit surface remains firm and smooth, although the internal rotted tissue becomes mushy. Lesions may enlarge to cover half or more of the fruit. Young green fruits may become mummified. White, cottony fungal growth may appear on affected fruits under moist conditions. Fruits touching or lying close to the soil are particularly susceptible. Phytophthora infection may cause damping-off in seedlings and root and crown rot in plants of different ages. Infected roots develop brown, water-soaked lesions that extend into the lower stem. Severely affected roots become necrotic and decayed. In young plants, root and crown infection may cause rapid wilting. On stems, pale-green to brown cankers may develop and extend for more than 15 cm. Fine fungal growth may appear on stem cankers under wet conditions. Cankers may girdle the stem, causing wilting and plant death. With P. capsici there is no possibility of symptoms on leaves. But, foliage blight and defoliation may occur during prolonged rainy weather and warm temperatures. This may be followed by complete plant collapse.