Image Number: 1402022

Descriptor:
Symptoms
Description:
This bacterial disease can occur in the plant bed or field. It most commonly occurs in the field in mid-summer during periods of cloudy, wet weather. Leaf spots develop, which are 1/4 to 1/2 inch in diameter and dark brown to black in color. They are limited by leaf veins making spots angular in shape. Concentric rings may be evident within the spots. Spots may coalesce, forming large irregular dead areas. The center of the spots may fall out, giving the leaf a ragged appearance. Leaves will turn yellow when numerous spots are present. Angular leafspot is most severe on lower leaves.
Image type:
Field

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Image location:
United States

Subject

Kingdom: Monera
Phylum: Proteobacteria
Class: Gammaproteobacteria
Order: Pseudomonadales
Family: Pseudomonadaceae
Genus: Pseudomonas
Subject: Pseudomonas syringae pv. tabaci (Wolf & Foster 1917) Young et al. 1978

Host

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (flue-cured type) L.
Node Affiliation:
Image uploaded:
Sunday, March 10, 2002
Image last updated:
Tuesday, May 17, 2011