Title: Florida plant disease management guide
ALL VOLUMES CITATION PDF VIEWER THUMBNAILS PAGE IMAGE ZOOMABLE
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00053871/00019
 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: VID00019
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

Downloads

This item has the following downloads:

PG11900 ( PDF )


Full Text




PDM G-V3-47
U UNIVERSITY of
UF FLORIDA
IFAS Extension



2007 Florida Plant Disease Management Guide: Pumpkin1


Pam Roberts and Tom Kucharek2


Specific Common Diseases

Alternaria Leaf Spot (Alternaria cucumerina)

Symptoms: This is not a common disease on
pumpkin in Florida. Small, dark circular spots (may
appear water-soaked) develop on leaves and enlarge
to 1/2 inch or more across. Concentric rings appear in
the brown spots as they enlarge, giving a "target spot"
appearance. Fruit is seldom attacked unless plants
are nutrient deficient. See Plant Pathology Fact Sheet
PP-32.

Chemical Controls: See PPP-6.

Angular Leaf Spot (Pseudomonas syringae
pv. lachrymans)

Symptoms: This is not a common disease in
pumpkin in Florida. Infections are found in the
leaves, stems, and fruit. Spots in the leaves are
irregular in shape, angular, and water-soaked. Free
moisture allows the bacteria to ooze from the spots,
which, upon drying, leaves a white residue. These
spots of dead tissue will occasionally drop away from
the healthy tissue leaving irregular holes in the leaves.


Cultural Controls: Use disease-free transplants.

Anthracnose (Colletotrichum lagenarium)

Symptoms: This is not a common disease on
pumpkin in Florida. The disease first appears in the
foliage as small, yellow, water-soaked spots which
enlarge rapidly and turn brown. The dead tissue dries
and may crack and fall out. In the stems, the lesions
are elongated. On the fruits, dark, circular, sunken
lesions appear, varying in size with the age. During
wet weather the center of the spots often show a
pinkish color due to production of spores.

Cultural Controls: Choose resistant varieties.

Chemical Controls: See PPP-6. Fungicides listed
for downy mildew and powdery mildew will be
useful.

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

Symptoms: This disease affects seedlings and is
caused by several soil-inhabiting fungi that are almost
universal in occurrence. These fungi infect portions of
the plant at or below the soil level, resulting in
collapse and death of the seedling. Conditions


1. This document is PDMG-V3-47, 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.A. Roberts, associate professor, Plant Pathology Department, Southwest Research and Education Center, Immokalee FL; T.A. Kucharek, professor
emeritus, 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: Pumpkin 2


unfavorable for rapid emergence of cantaloupes
(cool, wet weather) are usually most favorable for
this disease. See Plant Pathology Fact Sheet PP-1.

Chemical Controls: Plant only fungicide-treated
seed (most seed is commercially pre-treated). See
PPP-6.

Downy Mildew (Pseudoperonospora
cubensis)

Symptoms: This disease first appears on the
foliage as pale-green areas separated by islands of
darker green tissues. These spots develop into
angular, yellowish lesions. Older lesions become
brown and necrotic. Severely affected leaves may
become chlorotic, brown and shrivel. During moist
periods, a grayish spore mass may be observed on the
lower leaf surface on these spots. See Plant Pathology
Fact Sheet PP-2.

Cultural Controls: Choose resistant varieties, if
available.

Chemical Controls: See PPP-6.

Gummy Stem Blight (Didymella
bryoniae/Phoma cucurbitacearum)

Symptoms: This is not a common disease on
pumpkin in Florida. Lesions on the cotyledons and
leaves are round or irregular, brown, with faint
concentric rings. Lesions on the crown and stem are
brown and usually turn white with age. The causal
fungus can often be observed to reproduce on the
crowns or stem lesions and will form small pycnidia
(black specks). Asexual spores are produced within
the pycnidia in the plant tissue. The pathogen can be
spread by splashing rain from plant to plant, or be
carried long distances on wind currents. The fungus
"over-winters" on old plant debris and can be
seedborne. See Plant Pathology Fact Sheet PP-27.

Cultural Controls: Avoid planting in fields with
residual cucurbit crop debris still present.


Powdery Mildew (Sphaerotheca spp. or
Erysiphe spp.)

Symptoms: The fungus affects the leaves and
stems. It first appears as round whitish spots on the
under side of the older leaves. The spots increase in
number and size and coalesce. These appear on the
upper surface with a white powdery growth. Severely
affected leaves lose their normal dark-green color and
become pale yellow green, then brown and shrivel.
The young stems may also be killed. Fruits of
infected vines ripen prematurely, are of poor quality
and often sunburn.

Cultural Controls: Choose resistant varieties.

Chemical Controls: See PPP-6.

Viruses (Cucumber mosaic, Papaya
ringspot virus type W, Watermelon mosaic
virus 2, Zucchini Yellow mosaic virus)

Symptoms: Leaves show varying degrees of
mottling, distortion and stunting. Growth habit may
alter as infected vine tips appear more erect. Fruits
may be mottled, have greenish lines or ring spots, and
can be deformed. These viruses are spread by aphids.
See Plant Pathology Circular 1184.

Cultural Controls: Control weeds in and around
plantings. This will aid in virus control. Treating
fields repeatedly for aphid control is not
recommended because of the short time period
needed by aphids to transmit the virus while feeding.

Chemical Controls: See PPP-6.


Chemical Controls: See PPP-6.




University of Florida Home Page
© 2004 - 2010 University of Florida George A. Smathers Libraries.
All rights reserved.

Acceptable Use, Copyright, and Disclaimer Statement
Last updated October 10, 2010 - - mvs