Ralstonia Wilt in Geraniums

In April, Ralstonia solanacearum race 3 biovar 2 was detected on ‘Pink Flare’ geraniums (Pelargoniums) in a greenhouse in Michigan. These plants had originally come from Guatemala. USDA APHIS PPQ is working with state departments of agriculture on a multi-state trace-forward effort, attempting to track all annual geraniums of this variety that had originated from the Guatemala facility. At this time, nearly 400 facilities in at least 39 states received suspect nursery stock. Stop sale notices have been issued at all facilities and any suspect plants are in the process of being destroyed and the facilities disinfected. Fortunately, very few plants were shipped into Nebraska, but all nurseries are encouraged to monitor annual geraniums for symptoms of wilt.

Ralstonia solanacearum is a lethal bacterial disease, with a broad host range. The strain found in these geraniums can cause wilt in important crops including tomato, pepper and potato. The disease is also a concern for trade partners, and, should it become established in the United States, could negatively impact trade. Symptoms include wilting, yellowing, discoloration of the lower stem and root browning. Report any suspected infection of Ralstonia to the Nebraska Department of Agriculture at 402- 471-2351 or agr.plant@nebraska.gov, or by contacting your NDA inspector.