Location, Survival, Transmission and Control of Seedborne, Macrophomina phaseolina Causing Dry Root Rot and Leaf Blight in Urdbean Singh Jitendra, Kumar Kumud Department of Plant Pathology, C.S. Azad, Univ. of Agri. and Tech., Kanpur 208 002, India. Abstract Dry root rot and leaf blight of urdbean caused by Macrophomina phaseolina [=Rhizoctonia bataticola] is an important seed and soil-borne disease of India. Seeds of urdbean vars. PDU-1, IPU 981, IPU 94-2, IPU-982, Pant U-30, KU-82-29, T-9 and Pant U-19 carried 2 to 12% infection of M. phaseolina with maximum being in var. Pant U-19, Varieties IPU 96–12, PLU-241, PLU-137, KU-311 and KU-315 did not carry the fungal infection. The pathogen was invariably present in the seed coat of all the infected seeds and in the cotyledons of 35% infected seeds. The pathogen survived in infective state upto twenty months in seeds and was transmitted from to seedlings by local contact in the ratio of 1: 0.25 (seed infection: seed transmission). Seed treatment with topsin M (1.0 g/kg. seed), bavistin 50 WP, indofil M-45 and jkstein (each 2.0 g/kg. seed) eliminated the fungus from the infected seeds. Top Key words Dry root rot, Leaf blight, Macrophomina phaseolina, Urdbean. Top |