ANASTOMOSIS GROUPS OF RHIZOCTONIA SOLANI ISOLATED FROM SUGARBEET AND THEIR VIRULENCE IN RELATION TO CROP SEQUENCE | ||||
| Egyptian Journal of Agricultural Research | ||||
| Volume 72, Issue 2, August 1994, Page 483-494 PDF (2.88 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.1994.450699 | ||||
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| Author | ||||
| MOSTAFA M. A. EL-KHOLY | ||||
| Research Plant Pathologist, Sugar Crops Research Institute, Agricultural Research Centre, Giza, Egypt. | ||||
| Abstract | ||||
| Eight isolates of Thanatephorus cucumeris Frank (Dank) (Rhizoctonia solar?, Kuhn) isolated from sugarbeet seedlings and roots were multinuclate. Considering anastomosis, the isolates fell into two groups corresponding to AG-2 and AG-4. A greenhouse test was conducted to determine the effect of cotton, soybean, sugarbeet, beams and corn as crops preceding sugar-beet on Rhiroctonia seedling disease of the latter. All isolates of AG-2 and AG-4 showed different degrees in infection percentage and disease severity on seedling stage (15 and 30 days) on all,crops. Cotton, soybean and sugarbeet significantly increased pre- and post-emergence damping-off, while beans and corn were less conducive. Therefore, lower disease incidence in pre- and post-emergence stages could be obtained by not following cotton, soybean, or sugarbeet. Advantage of reduced damping-off in sugarbeet following corn in rotation is apparent. | ||||
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