Title: Florida plant disease management guide
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Permanent Link: http://ufdc.ufl.edu/UF00053871/00026
 Material Information
Title: Florida plant disease management guide
Alternate Title: Ornamentals and turf
Fruit and vegetables
General plant pathology, field crops and pasture grasses, fungicides, adjuvants and application techniques
Physical Description: v. : ; 28 cm.
Language: English
Creator: University of Florida -- Dept. of Plant Pathology
Florida Cooperative Extension Service
Publisher: The Extension
Place of Publication: Gainesville Fla
Frequency: annual
regular
 Subjects
Subject: Plant diseases -- Periodicals -- Florida   ( lcsh )
Pesticides -- Periodicals   ( lcsh )
 Notes
Statement of Responsibility: Plant Pathology Dept., University of Florida and Institute of Food and Agricultural Sciences, Florida Cooperative Extension, University of Florida.
Numbering Peculiarities: Issued in three volumes: v. 1, General plant pathology, field crops and pasture grasses, fungicides, adjuvants and application techniques; v. 2, Ornamentals and turf; v. 3, Fruit and vegetables.
General Note: Description based on: 1999-2000.
General Note: "SP-52"
 Record Information
Bibliographic ID: UF00053871
Volume ID: VID00026
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 44549741
lccn - 00229071
 Related Items
Preceded by: Florida plant disease control guide

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PDMG-V3-54
U UNIVERSITY of
UF FLORIDA
IFAS Extension



2007 Florida Plant Disease Management Guide:

Watercress1


Pam Roberts2


Specific Common Diseases

Cercospora Leaf Spot (Cercospora nasturtii)

Symptoms: Round to oval lesions develop on
leaves. Leaf spots are light-colored and may coalesce
to cover large areas of tissue. The pathogen produces
abundant spores that are easily water-splashed or
airborne.

Cultural Control: Insure that previous
watercress debris is well decomposed before
replanting of land. Eradicate volunteer plants and
weed relatives in the Nasturtium genus to prevent
carry over of this fungus from the field perimeter.

Chemical Control: See PPP-6.

Damping-Off (Rhizoctonia, Pythium,
Fusarium, and Sclerotinia spp.)

Symptoms: The distribution of seedlings that
damp-off may be at random or in rapidly enlarging
circular areas in the seedbeds. In the latter case,
lesions may be observed well up on the petioles as
well as the soil line. Entire plantings may be lost


unless adequate control measures are practiced. Do
not transplant disease plants.

Chemical Control: See PPP-6.

Rhizoctonia Rot (Rhizoctonia solani)

Symptoms: Rhizoctonia is a soilbore fungus that
can cause a damping-off of seedlings or seeds, as
well as a mature plant decline from rot and stem
decay. The fungus often invades at soil line
producing a light-to-reddish-brown canker on the
lower stem. Lower leaves exhibit yellowing,
followed by necrosis and progressive plant wilt to
death.

Cultural Control: Insure summer vegetation or
previous crop debris is well decomposed prior to
planting.

Chemical Control: See PPP-6.


1. This document is PDMG-V3-54, one of a series of the Department of Plant Pathology, 2007 Florida Plant Disease Management Guide, Florida Cooperative
Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Revised December 2005. Reviewed January 2007. Please visit the
EDIS Web site at http://edis.ifas.ufl.edu.
2. P.D. Roberts, associate professor, Southwest Florida Research and Education Center, Immokalee, FL; Plant Pathology Department, Florida Cooperative
Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611.

The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and
other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex,
sexual orientation, marital status, national origin, political opinions or affiliations. U.S. Department of Agriculture, Cooperative Extension Service,
University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Larry
Arrington, Dean






2007 Florida Plant Disease Management Guide: Watercress 2

Viral Diseases (Cucumber mosaic, Cabbage
Leaf Curl)

Symptoms: A single virus or multiple infection
of several viruses can produce a variety of plant
symptoms that include mosaic leaf distortion, ring
spotting and stunting. Cucumber mosaic virus is
vectored be aphids in a semi-persistent manner.
Cabbage leaf curl virus is vectored by white flies.

Cultural Control: Clean field and field borders
of volunteer crops and weeds to minimize reservoirs
for both vector insects and viruses.




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