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

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