Anastomosis Groups and Pathogenicity of Rhizoctonia solani Kühn Isolates Isolated from Pistachio (Pistacia vera L.) Saplings in Siirt Province, Turkey

Pathogenicity and anastomosis groups of seven Rhizoctonia-like isolates obtained from infected pistachio (Pistacia vera L.) seedlings were determined, in the central district Siirt province at Southeast Anatolia Region Turkey. Browning on crown root collected saplings drying plants observed. In pathogenicity test, most virulent isolate was Rs2 with a disease severity 93.75%. The group this isolate, which caused to dry completely determined as Rhizoctonia solani AG-4. moderately Rs3 Rs1 binucleate AG-F group. These two yellowing seedling leaves browning roots, however, did not die preserved their vitality certain extent. R9 R14 identified cause any symptoms inoculated negative control. Rs7 Rs10 AG-4 be pathogenic saplings. results study are first record for virulence species that diseases pistachio.