Ralstonia Webinar: What You Need to Know

Ralstonia solancearum race 3 biovar 2 (R3B2), a federal quarantine pest, was recently confirmed in a single geranium variety in a greenhouse in Michigan, the first confirmed case in the US since 2004. Diseased geraniums planted in the landscape can potentially infect other plants, including tomatoes, potatoes, peppers, and eggplant and must be destroyed.

Since the detection was confirmed, AmericanHort has collaborated with the importer of the geranium and with USDA APHIS toward the goal of a rapid, targeted, and effective response that minimizes unnecessary interruption. HRI is proud to join this effort and host a webinar on the basics of R3B2, such as how it spreads and prevention strategies, to help educate the green industry. APHIS will be on hand to discuss the recent action plan, and Ball Horticultural Co will share their story.



  • Welcome & Introductory Remarks
    Dr. Jill Calabro, HRI/AmericanHort Science & Research Director
  • Ralstonia Basics & Prevention Strategies
    Dr. Caitilyn Allen, the Ethyl and O.N. Allen Professor, Department of Plant Pathology, University of Wisconsin-Madison
    Slide Deck
  • APHIS Action Plan
    Dr. Matthew Royer, Associate Deputy Administrator Field Operations USDA APHIS PPQ
    Slide Deck
  • Ball Horticultural Co. Update
    Dr. Mike Klopmeyer, President Ball FloraPlant
    Slide Deck

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