Reference Report for IND20499857
| Title: | Characterization and pathogenicity of Rhizoctonia from soybean. |
| Authors: | Nelson, B., Helms, T.C., Christianson, T., Kural, I. |
| Source: | Phytopath. 1996, 81(10):1202-1202 |
| Abstract: | Of 102 isolates of Rhizoctonia recovered from roots and stems of soybean, 98 were R. solani and were identified to four anastomosis groups (AG): AG-2-2 (3.1%), AG-3 (2.0%), AG-4 (45.9%), and AG-5 (37.8%); 10.2% of the isolates did not consistently anastomose with any of the tester isolates (AG-1 to 9 and AG-BI). Four isolates from roots were binucleate Rhizoctonia. AG-2-2, AG-4, and AG-5 were virulent on soybean seedlings and adult plants, whereas AG-3 caused small lesions only on tap roots of adult plants. The binucleate Rhizoctonia were not pathogenic on soybean. AG-5 was generally less virulent on soybean than AG-2-2 and AG-4, but when inoculum was placed in direct contact with seeds, AG-5 caused high levels of pre- and postemergence damping-off. AG-5 also caused high disease severity ratings on adult soybean when the inoculum level was increased. Sugar beet seedlings were highly susceptible to AG-2-2 and AG-4, but only slightly susceptible to AG-5. Dry bean, mustard, and flax seedlings were susceptible to AG-2-2 and AG-4, and dry bean and flax were slightly susceptible to AG-5. AG-4 and AG-2-2 caused moderate reductions in emergence of sunflower, and AG-2-2 caused a root rot on corn seedlings. These results indicate that AG-5 could be an important soybean pathogen and that other rotational crops are hosts to R. solani recovered from soybean. |
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