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Grey Blight/ Pestalotiopsis Leaf Spot of mango
In India, this disease has been reported from many states.
Symptoms Brown spots develops at the margins and tip if the leaf lamina and distributed irregularly on entire leaf. Initially the spots are brown and minute and they gradually increase in size and become dark brown. Black dots appear at the center of the spots represent the acervuli. On mature green fruits, small brown spots appear with grayish white center which later turns to bigger lesions with large number of acervuli seen as black dots. Etiology Pestalotiopsis mangliferae (P.Henn.) Stey. The fungus produces septate mycelia and acervulus as an asexual fruiting body. Conidia are5-celled, oblong to clavate or clavate to fusiform, colored cells are 15-16 micro meter long, upper two of them slightly darker than the lowest olivaceaus colored cells, septa and walls sometimes black and will have long pedicel; setulae 3, coarse, widely divergent and 19-26 micron long. Mode of spread and survival |
Last modified: Monday, 16 January 2012, 4:52 AM