Grower asked if pink stain from hydrogen peroxide on cut tissue indicates Fusarium wilt without the diagnostic pink ring. Expert: diagnostic marker is pink fibrovascular bundles (xylem/phloem). AOS recommends: discard infected rhizome/pseudobulbs, keep only tissue without purple discoloration, destroy diseased material, sanitize. Osmunda can carry spores—treat with 4% formalin. Dip in benomyl (1 tsp/gal). Repot in new mix with drainage. Peroxide reaction unknown; possibly oxidation of plant pigments.
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