Image Number: 1440027

Descriptor:
Symptoms
Description:
Spots are tan colored, with minute dark circular specks present on the surface of the spot. Brown spot and ragged leaf spot may be confused. The presence of distinct, circular, black fruiting bodies (pycnidia), which may be seen under magnification, distinguishes this disease from brown spot. The tissue in the spot may become papery-thin, tearing easily and giving the spot a ragged appearance. This disease is usually of minor importance, showing up late in the season on the lower leaves.
Image type:
Field

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Image location:
United States

Subject

Kingdom: Fungi
Phylum: Ascomycota
Subphylum: Pezizomycotina
Class: Dothideomycetes
Subclass: Dothideomycetidae
Order: Pleosporales
Family: Incertae sedis
Genus: Phoma
Subject: Phoma exigua var. exigua Sacc.

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:
Wednesday, March 16, 2011