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In August 2018, sugar beet plants with dull green and chlorotic foliage were observed in Hickson (46.6694°N, 96.8104°W), North Dakota. The taproots were found to have several circular brown to black necrotic lesions (Fig. 1) and the disease incidence was about 5%.
Beet roots were washed to remove soil particles, surface-sterilised in a 10% NaOCl solution for 1 minute, and dipped twice in sterile water. Isolations were done on potato dextrose agar (72 hr at 25 ±2°C). All colonies were white and the surface was feathery (Fig. 2). Ten isolates were examined and these consistently had verticillate and penicillate conidiophores (primary and secondary) similar to those illustrated by Afshari & Hemmati (2017)....