Investigation on sensitivity of different crops to Rhizoctonia solani in Kerman province

In this study، sensitivity of different field crops to isolates of Rhizoctonia solani was studied in order to apply more successful crop rotation program in Kerman Province. Disease severity indices (DSI) were measured by grading scales of 0-5 in vitro and 1-9 in vivo conditions which were regarded as the basis of host susceptibility. The results of disease severity evaluations showed that maize and wheat with DSI of 1. 66 and 0. 58 in laboratory condition and 1. 46 and 2. 63 in greenhouse had the minimum sensitivities respectively. Sugar beet and safflower with severity indices 3/52 and 3/40 in laboratory condition and tomato and melon with 7/22 and 6/37 in greenhouse conditions were the most susceptible species to anastomosis groups 2، 3 and 4. Our results show that anastomosis group 4 had the highest while anastomosis group 3 had the lowest disease severity indices under the two conditions of laboratory and greenhouse. Disease severity indices were different among isolates belonging to same anastomosis groups، and within different anastomosis groups.