Parthasarathy SeethapathyDepartment of Plant Pathology, Tamil Nadu Agricultural UniversityCoimbatore, IndiaEmail: email@example.com
Host: Black gram (mung bean)Host Latin name: Vigna mungo (L.) Hepper Disease name: Powdery mildewPathogen: Erysiphe polygoni DC.
White, powdery patches appear on leaves and other green parts and later become dull in color. These patches gradually increase in size and become circular, covering the lower surfaces as well. Severely affected parts become shriveled and distorted. In severe infections, foliage turns yellow, causing premature defoliation. The disease also forces maturity of the infected plants, which results in heavy yield losses. The fungus is ectophytic, sending haustoria into the epidermal cells. Conidiophores arise vertically from the leaf surface, bearing conidia in short chains. Conidia are hyaline; thin walled; elliptical, barrel shaped, or cylindrical; and single celled. Chasmothecia appear as minute, black, globose structures with myceloid appendages. Each cleistothecium contains four to eight asci, and each ascus contains three to eight ascospores, which are elliptical, hyaline, and single celled.
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