Characterization of Rhizoctonia solani associated with root/collar rots and blights


Abstract views: 196 / PDF downloads: 155

Authors

  • S. SUNDER, H.R. KATARIA, SATYAVIR and O.P. SHEORAN

Keywords:

Anastomosis, blight, Rhizoctonia solani, root/collar rot, sclerotia, virulence

Abstract

One hundred-twelve isolates of Rhizoctonia solani were collected from soil, root and collar rot or foliage blight infected plants from several locations in Haryana. Of these, 43% belonged to anastomosis group-1 (AG-1 lA, AG-1 IC), 37% to AG-4, 9% to AG-3 and 11% to AG-7. Studies on 20 selected isolates of different AGs revealed considerable variability in their cultural and morphological characters, growth and virulence. Sclerotia were large (1-4 mm) and produced in abundance in AG-1 IA but these were generally few and small in other AGs. Isolates of AG-7 had the narrowest (7.2 JJm)while those of AG-3 had the widest (9.0 JJm)hyphae. Wide variations were recorded in virulence among different AGs. Isolates of AG-1, AG-4 and AG7 were moderate to highly virulent on hypocotyls of mungbean and chickpea. Leaves of rice were severely infected by AG-1 lA, while AG-1 IC and AG-4 caused mild infection. Isolates of AG-3 failed to infect either group of hosts. It is the first report on occurrence of AG-7 in India.

Downloads

Issue

Section

Research Articles

How to Cite

Characterization of Rhizoctonia solani associated with root/collar rots and blights. (2003). Indian Phytopathology, 56(1), 27-33. https://epubs.icar.org.in/index.php/IPPJ/article/view/18230