Colletotrichum Leaf Spot

Sundraraman (1922) reported this disease from the Godavari district of Andhra Pradesh (India). Later Wallace and Wallace (1945) described the disease from the Tanganyika territory.

Symptoms

Symptoms manifest as small round to oval, light yellow spots on leaves and leaf sheaths. These spots gradually increase in size and often coalesce to form large discolored areas. Such infected areas often dry up at the center, forming holes. In the case of a severe attack, the entire leaf dries up.

The Pathogen

Butler and Bisby (1931) named the leaf spot—causing fungus Colletotrichum zingiberi (Sundar).

The disease makes rapid progress during the rains. Continued wet weather with high temperature favors the disease development. Shade is considered unfavorable for progression of the disease (Briton-Jones, 1933).

Control Measures

Two spray applications of Bordeaux mixture (1 percent) at an interval of 6 weeks effectively control the disease (Iyer, 1987). Removal and burning of affected plants also reduce the disease spread. Briton-Jones (1933) indicated that cultivation of a ginger crop under shade resulted in less disease incidence.

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