- Initially small, elliptical lesions or spots that often turn purplish-brown which are surrounded by chlorotic margin. If the spots enlarge, chlorotic margin extend above and below the actual lesion. Lesions usually girdle leaves, causing them to fall over. Lesions may also start at the tips of older leaves.
- Hot and humid climate temperature ranging from 21-30 oC and relative humidity (80-90%) favour the development of the disease.
- The Infected plants fail to develop bulbs.
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