First report of potato wilt caused by Plectosphaerella cucumerina in Inner Mongolia, China.
In late August 2015, diseased plants with symptoms resembling potato wilt were observed on 'Shepody' in three locations in Chayouzhongqi, Wulanchabu City, Inner Mongolia, China. The disease incidence ranged from 5 to 10%. Based on morphological characteristics, DNA sequence analysis and pathogenicity, the causal agent was identified as Plectosphaerella cucumerina [Monographella cucumerina]. This fungus was firstly reported on tomato in Italy; it was then isolated from wild rocket (Diplotaxis tenuifolia), lettuce and sunflower. This is thought to be the first report of P. cucumerina causing potato wilt in Inner Mongolia. Because P. cucumerina is a soil-borne pathogen, crop rotation between potato and sunflower in this region would facilitate the cross-infection on both hosts.