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bioRxiv · 10.1101/2025.01.17.633665

Novel pink-spot disease in North American kelpnurseries

Schenk, S.·Jackman, A. S.·Clark, J.·Parfrey, L.
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Abstract

Macroalgal cultivation is a growing industry in North America, but is well established in Asia and Africa, where macroalgal disease cause crop losses, placing a significant economic burden on farmers. As kelp cultivation intensifies in North America, kelp disease prevalence is expected to increase in tandem. With input from the kelp-growing community through an online survey, we describe the prevalence of a novel kelp disease, pink-spot disease, which has been observed in Canada and the United States on Saccharina latissima, Alaria marginata, Nereocystis luetkeana, and Macrocystis tenuifolia. Eight of the fourteen (57%) surveyed kelp growers report bright pink spots (pink-spot disease) on their kelp spools in the land-based nursery stage. Along with the grower survey, we conducted 16S rRNA amplicon sequencing in 2021 and 2022 to investigate the causative agent of pink-spot disease and associated bacterial community changes on infected Saccharina latissima (sugar kelp) spools. Our data in both years show that a member of the genus Algicola is enriched on visibly diseased spool regions compared to asymptomatic spool regions and may be the causative agent of pink-spot disease. As macroalgal cultivation continues to intensify, monitoring diseases is important to mitigate potential negative impacts.

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Schenk, S., Jackman, A. S., Clark, J., Parfrey, L.. 2025-01-22. Novel pink-spot disease in North American kelpnurseries. https://doi.org/10.1101/2025.01.17.633665

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