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Group Title: ARC-A research report - Agricultural Research and Education Center - RH-82-17
Title: Two foliar diseases of Euonymus SPP.
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Permanent Link: http://ufdc.ufl.edu/UF00066472/00001
 Material Information
Title: Two foliar diseases of Euonymus SPP.
Series Title: ARC-A research report
Physical Description: 2 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Agricultural Research Center (Apopka, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1982
 Subjects
Subject: Euonymus -- Diseases and pests -- Florida   ( lcsh )
Foliage plants -- Diseases and pests -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 2).
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00066472
Volume ID: VID00001
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 71211252

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The publications in this collection do
not reflect current scientific knowledge
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Agricultural Sciences and should be
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DISEASES OF EUONYMUS SPP.


2 1j, A. R. Chase
University of Florida IFAS
i.F.A.S.-Univ nf F i ltural Research Center-Apopka
..S--- U----i. of F A Research Report RH-82-17


Some of the newer crops in the cut foliage industry are Euonymus spp.
There are two foliar diseases which have been described on euonymus;
Colletotrichum leaf spot (also called anthracnose), and Phytophthora aerial
blight.

Colletotrichum leaf spot is the most common disease of Euonymus spp.
in Florida and is caused by Colletotrichum gloeosporioides. The disease was
first described on E. fortunei cultivars 'Emerald 'n Gold' and 'Gaiety' in
commercial woody ornamental nurseries in New England in 1980 (2). Leaf
spots start as light brown 1/32 1/16 inch wide areas with reddish margins.
When weather conditions are hot and rainfall is high, these leaf spots
enlarge to 1/4 1/2 inch wide and have concentric rings of light and dark.
In addition, the shoot tips of infected plants can be severely infected and
leaf abscission is common giving these plants a blighted appearance. Although
this disease has only been reported on E. fortunei it also occurs on several
cultivars of E. japonica (Table), grown for cut foliage production in Florida.
Newly rooted cuttings appear to be especially susceptible to Colletotrichum
leaf spot which can even kill them if preventative measures are not initiated
rapidly. Use of maneb, mancozeb, and chlorothalonil are reported to
completely protect euonymus from Colletotrichum leaf spot (2). Labels of
these products should be consulted to verify safety (with respect to
phytotoxicity) on euonymus as well as rates and intervals of applications.

A second foliage disease of Euonymus sp. is Phytophthora aerial blight
caused by an unidentified species of Phytophthora. This disease was first
described in California in 1981 on E. japonica cultivars in woody ornamental
nurseries (1) (Table). Disease occurs first on shoot tips during the
rainy season and appears as a slightly brown, wilted condition. The tissue
then dries out and becomes a dark brown. Infection gradually advances down
the stem until the entire shoot is killed. Phytophthora aerial blight of
euonymus has not been reported in Florida. However, many other foliar blights
caused by Phytophthora spp. occur in Florida and growers should watch for this
disease on euonymus. If Phytophthora aerial blight is diagnosed, several
fungicides may be used which successfully control Phytophthora spp., including
ethazole and metalaxyl. Since the pathogen lives in the soil, special care
should be taken to treat soil as well as foliage of the plants. As always,
consult pesticide labels prior to use to insure safety (with respect of
phytotoxicity), rate, and interval of application.








Table- Known susceptibility of some Euonymus species and cultivars to two

foliar diseases. No euonymus are known to be resistant to either

pathogen.-


Species Cultivar Disease
Col etotrichum Phytophthora

Euonymus
fortunei Emerald Gold +
Gaiety +
Euonymus
japonica Aureo-marginata +
Gold Spot + +
Microphylla +
Non-variegated + +
Silver King +
Silver Queen + +


References-

1. Keim, R., L. J. Klure, and G. A. Zentmyer. 1981. A foliage blight

of euonymus caused by Phytophthora. California Agriculture 35(5,6):16-17.

2. Mahoney, M. J. and T. A. Tattar. 1980. Identification, etiology, and

control of Euonymus fortunei anthracnose caused by Colletotrichum

gloeosporioides. Plant Disease 64:854-856.




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