VIEW ARTICLE

Ecology and Epidemiology

Suppression of Damping-Off Caused by Rhizoctonia Species by a Nonpathogenic Isolate of R. solani. Meira Ichielevich- Auster, Department of Botany, Institute for Nature Conservation Research, and Department of Microbiology, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel 69978; Baruch Sneh(2), Yigal Koltin(3), and Isaac Barash(4). (2)(3)(4)Department of Botany, Institute for Nature Conservation Research, and Department of Microbiology, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel 69978. Phytopathology 75:1080-1084. Accepted for publication 25 March 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/Phyto-75-1080.

Among 107 isolates of Rhizoctonia spp. obtained from soil samples in Israel, 32 isolates were nonpathogenic to eleven hosts. The pathogenic and nonpathogenic isolates represented anastomosis groups (AG) 1, 2, 3, 4, 5, and 6 of R. solani, two groups of R. zeae, and three groups of binucleate Rhizoctonia spp. (AG-A, AG-F, and AG-K). A nonpathogenic isolate of R. solani (AG-4) suppressed damping-off caused in cotton, radish, and wheat seedlings by virulent isolates of R. solani and R. zeae by 76- 94%.