A scanning electron microscope has been employed to explore the ultrastructural features of stem lesions in peas caused by the fungal pathogen Sclerotinia sclerotiorum and to determine the mode of entry of this fungus into potato leaves. Wax rodlets covered the parchment-like tissue of the stem lesion of peas but were relatively sparse on the healthy stem surface. Hyphae from agar discs supporting growth of the fungus penetrated stomatal openings on the adaxial leaf surfaces of potato plants.
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