First report of Fusarium solani causing fusarium root rot and stem canker on storage roots of sweet potato in China.

摘要

Surveys of diseases of sweet potato in storage were conducted from 2011 to 2013 in Hebei Province, China. The storage roots from cultivars such as Yizi 138 and Beijing 553 developed lesions on the surface during storage. Typical lesions consisted of alternating light and dark brown concentric rings that were darker than the root surface. The size of the lesions was 49 x 63 mm on average. The lesion spot was slightly concave. Cutting the diseased roots revealed that the lesions could extend into the centre of the roots, often with cavities. It smelled bitter within the necrotic tissues and was dark brown or black. The disease incidence was approximately 10-20%. A Fusarium species was consistently isolated from the diseased roots. Based on morphological characteristics, the fungal isolates were identified as F. solani [Haematonectria haematococca]. This is thought to be the first report of F. solani causing Fusarium root rot and stem canker on storage roots of sweet potato in China.