Study the Efficiency of Fusarium oxysporum. f. Sp. tuberosi Isolates on Potato Tubers )Solanum tuberosum L. (from "cv. Spunta"

Abstract

The diseased potato plant samples (Solanum tuberosum L.) (cv. Spunta) infected by the Vascular wilt and Dry rot on the tubers had aggregated from many research centers AL Ghab, Tartous, and Homs, and stations jmmaza, Jussie, gota and Srugaia (AL-Zabadani) in  the general commission of the agricultural scientific research in Syria over two seasons 2018 and 2019. the genus and F. oxysporum  Had  been defined from  the fungal population. Ten isolates of F. oxysporum. f. sp. tuberosi  (FOT) monospores were selected according to Van Dieghem by using the method of hanging  small drop. The morphological and microscopically of the isolates were identified. The pathogenicity test was conducted on potato tubers from (cv. Spunta). The data was recorded to three replicate tubers from each treatment in addition to the control. All the isolates were pathogenic causing Dry rot disease on the tubers, but that isolate FOT23 was the most virulence compared with other isolates, While the isolate FOT49 had the weaker virulence.