First report of Fusarium oxysporum causing damping‐off on Datura stramonium in France
Résumé
Datura stramonium (jimsonweed, thorn apple) is a toxic, invasive weed of summer crops. It contaminates grains during harvest, causing health problems (Perharič et al., 2013; Mutebi et al., 2022). In July 2022, in a maize plot near Toulouse (France), c. 36 plants of D. stramonium per m2 were counted. One to two plants with crown shrinkage symptoms were detected every 10 m2 (Fig. 1). Fifteen diseased plants were collected. The stem base of each plant was surface disinfected, cut into pieces, and plated on malt extract agar. Fusarium oxysporum-like colonies grown from these fragments were purified by single-spore sub-culturing and preserved in the Microorganisms of Interest for Agriculture and Environment (MIAE) collection (INRAE Dijon, France). Colonies transferred onto potato dextrose agar for macroscopic observations exhibited white aerial mycelium, becoming progressively pink (Fig. 2). Microscopic examination of cultures on carnation leaf agar revealed oval single-celled microconidia and multicellular spindle-shaped macroconidia characteristic of F. oxysporum (Fig. 3; Nelson et al., 1983).
Domaines
Agronomie
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New Disease Reports - 2024 - Pilet - First report of Fusarium oxysporum causing damping‐off on Datura stramonium in France.pdf (624.6 Ko)
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