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Lunch & Learn | Epidemiology and integrated management of bacterial leaf spot caused by Pseudomonas syringae pv. aptata in table beet and Swiss chard seed production in the Pacific Northwest

October 28 @ 12:00 pm - 1:00 pm

Close-ups of diseased chard flank agar plate with live culture; two women stand next to text plot.

Epidemiology and integrated management of bacterial leaf spot caused by Pseudomonas syringae pv. aptata in table beet and Swiss chard seed production in the Pacific Northwest

Presented by Marilen Nampijja and Stephanie Crane. Bacterial leaf spot (BLS) of beet and Swiss chard (Beta vulgaris subsp. vulgaris) is caused by the bacterial pathogen Pseudomonas syringae pv. aptata (Psa). The bacterium can cause significant economic losses in Swiss chard, table beet, and sugar beet. In 2017 alone, the incidence of BLS in New York table beet crops was 75%. Given the seedborne nature of this pathogen, the genetic similarity of strains of the pathogen to non-pathogenic strains of P. syringae, the host range of the pathogen (including crops in other plant families than Chenopodiaceae), a federally-funded research project on Psa was initiated in 2019. Over the next four years, 18 investigators from nine institutions in two countries will work together to develop an economically-sound, integrated approach to manage BLS across seed and food production systems of host plants in the Chenopodiaceae and Cucurbitaceae, to ensure high-quality seed and food crops. The research objectives of this study include developing pathogen detection and quantification methods for testing seed and other inoculum sources, identifying primary sources of inoculum of Psa in table beet and Swiss chard seed and production fields, clarifying the disease cycle of Psa in different cropping systems and regions, breeding for resistance to BLS, and developing more effective integrated management programs for BLS. The management aspects include determining the location of the pathogen on/in seed, assessing the risks of seed transmission, and evaluating diverse seed treatments as well as in-field production practices to reduce the negative impacts of Psa on our ability to produce healthy Chenopodiaceae and Cucurbitaceae crops. Marilen Nampijja and Stephanie Crane will share information on their respective graduate research projects at WSU on BLS, and how stakeholders can contribute to the overall project.

You will need to register to receive a link to attend the seminar via Zoom.

This seminar has been approved for one (1) WSDA Pesticide License Recertification Credit.


This seminar is part of our new Pesticide Recertification Seminar Series, which will include 11 opportunities to earn a recertification credit! Thank you to Lydia Tymon and Carol Miles for their work in organizing this.

Details

Date:
October 28
Time:
12:00 pm - 1:00 pm
Event Category:
Website:
http://mtvernon.wsu.edu/lunch-seminars#zoom

Organizer

Mount Vernon NWREC
Phone:
360-848-6120
Email:
AMS.MountVernon@wsu.edu
Website:
mtvernon.wsu.edu