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North Sumatra Province still lacks shallots every year. the obstacles that are often encountered and seen in farmers’ fields are disturbance of plant pests, generally diseases, especially fusarium basal rot disease. The purpose of this study was to detect the emergence of Fusarium isolates from various sources of infection locations against the increasing attack of fusarium bulbs rot that occurred in 2018 to 2019. Shallots are cultivated on Karo regency in Tongging Village, Rimokayu Village, Tiganderket Village and Payung Village. Statistical analysis showed that the Tongging Fusarium isolate was the most virulent against all the local accession. While Payung Fusarium most virulent against Rimokayu and Payung accession, and Tiganderket Fusarium is the most virulent against Rimokayu and Tiganderket accession. Only two isolates were among the highest virulent, that Tiganderket Fusarium isolate against Payung accession and Tongging accession, and Payung Fusarium isolate against Tiganderket accession and Tongging accession. Batu Bara Fusarium isolate and Deli Serdang Fusariu isolate, was classified as virulence and least virulent against Tongging accession, Payung accession, Tiganderket accession, and Rimokayu accession.

Virulence test of fusarium isolates against local shallot accessions in the highlands of Karo regency