Image Number: 1440055

Descriptor:
Symptoms
Description:
Fusarium wilt usually appears in clusters of plants in the field. Yellowing and drying of the leaves on one side of a tobacco plant are typical symptoms. If a strip of the outer stem tissue (bark) is removed from the side of the stalk with yellowed leaves, a brown discoloration of the wood or vascular tissue is present rather than the normal white color. This discoloration usually can be traced from the affected part of the stalk down into the roots. The midribs of leaves on the affected side of the plant are often curved to one side with half of the leaf yellowed and the other half remaining green. In a young plant, the bud may bend toward the side of the plant with the yellowed leaves. Wilting, although implied by the name of this fungal disease, is not typical of diseased plants.
Image type:
Field

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Image location:
United States

Subject

Kingdom: Fungi
Phylum: Ascomycota
Subphylum: Pezizomycotina
Class: Sordariomycetes
Subclass: Hypocreomycetidae
Order: Hypocreales
Family: Nectriaceae
Genus: Fusarium
Subject: Fusarium oxysporum f.sp. nicotianae (Johnson) W.C. Snyder & H.N. Hansen

Host

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (burley type) L.
Node Affiliation:
Image uploaded:
Monday, January 1, 1990
Image last updated:
Monday, May 9, 2011