Helminthosporium Leaf Spot

McRae (1926) reported this disease for the first time in Pusa (Bihar). Symptoms

The disease appears during the rainy season in the form of small oval spots measuring 4 to 5 X 2 to 3 mm in diameter on the leaves. The spots remain scattered on both surfaces of the leaves. The spots later enlarge in size. The mature spots have a centrally dead straw-colored area surrounded by a brown ring with a yellowish zone on the outside.

The Pathogen

McRae (1926) described the morphology of the species of Helminthosporium associated with the disease. Later on, Mitra (1930) reported that the species is a strain of H. maydis

Nisikado and Miyaka. Again in 1931, Mitra considered this strain to be different from the strain of H. maydis occurring on maize.

The conidiophores arise from the central dead area of the spot on the leaf, and the conidia are straight to crescent shaped with ends that are round, brown, have three to nine septa, and measure 43 to 109 (X in length and 11.5 to 20.0 ^ in breadth. The fungus grows best between 25 and 35°C. The growth of the fungus is favored by darkness. The thermal death point of the fungus is between 63 and 64°C.

Control Measures

The disease has very limited occurrence. There are no reports in the literature on the management of this leaf spot disease.

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