Group Title: Mimeo Report - University of Florida Everlgades Experiment Station ; EES63-21
Title: Bacterial leaf spot of cabbage
Full Citation
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 Material Information
Title: Bacterial leaf spot of cabbage
Series Title: Everglades Station Mimeo Rpt.
Physical Description: 1 p. : ; 29 cm.
Language: English
Creator: Wehlburg, Cornelis, 1903-
Everglades Experiment Station
Publisher: Everglades Experiment Station
Place of Publication: Belle Glade Fla
Publication Date: 1963
Subject: Cabbage -- Diseases and pests -- Florida   ( lcsh )
Leaf spots -- Florida   ( lcsh )
Genre: non-fiction   ( marcgt )
Statement of Responsibility: C. Wehlburg.
General Note: "May, 1963."
Funding: Everglades Station Mimeo Report ;
 Record Information
Bibliographic ID: UF00067460
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 63681058

Full Text

Everglades Station Mimeo Rpt. 63-21

Bacterial Leaf Spot of Cabbageli

May, 1963

C. Wehlburg

Cabbage growers have long been familiar with dark brown spots of the cabbage
heads, a disease that in some years can cause serious damage to the crop.

Usually it is only the outside or wrapper leaf that is affected. Sometimes,
however, the spots can be found on the inside leaves after peeling off the outer
leaves. The spots on the younger leaves usually do not correspond with those of
the leaf that covered them which indicates that the pathogen has been growing
systemically. Cross sections through the stem of these plants usually showed
darkened vascular bundles; bacteria could be seen both in the vessels and in
the surrounding parenchyma.

From leaf spots and from diseased stem tissue a bacterium was isolated and
identified as Pseudomonas cichorii (Swingle) Stapp. Inoculations made in the
petioles of young potted cabbage plants produced a rapidly enlarging dark spot.
An aqueous suspension of the bacteria sprayed on heading cabbage in the green-
house produced similar spotting as in the field.

P. cichorii has been isolated from escarole, and from ornamental chrysan-
themum. Dr. Thayer has also found that all his isolates from bacterial leaf
blight on celery were P. cichorii. All the isolates taken from celery, escarole,
cabbage and chrysanthemums were pathogenic on cabbage.

1/ Prepared for presentation at the Annual Vegetable Crops Field Day held at
the Everglades Experiment Station May 9, 1963.

/ Associate Plant Pathologist, Everglades Experiment Station, Belle Glade, Fla.

EES Mimeo Rpt. 63-21
400 copies


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