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Group Title: ARC-A research report - Agricultural Research and Education Center - RH-83-22
Title: Euonymus Anthracnose
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Permanent Link: http://ufdc.ufl.edu/UF00066508/00001
 Material Information
Title: Euonymus Anthracnose influence of cultivars, shade level and increased disease pressure
Series Title: ARC-A research report
Physical Description: 4 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: 1983
 Subjects
Subject: Euonymus -- Diseases and pests -- Florida   ( lcsh )
Anthracnose -- Control -- Florida   ( lcsh )
Colletotrichum gloeosporioides -- Control -- Florida   ( lcsh )
Plants -- Effect of shade on -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 3).
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00066508
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 - 71232112

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< 3 z2- EUONYMUS ANTHRACNOSE INFLUENCE OF

CULTIVARS, SHADE LEVEL AND INCREASED DISEASE PRESSURE


A. R. Chase
IFAS, University of Florida
Agricultural Research Center Apopka
ARC-A Research Report, RH-1983-22

The most serious disease of Euonymus spp. in Florida is anthracnose,

caused by Colletotrichum gloeosporioides. Under severe conditions, which

occur during the summer months on plants grown outdoors, the disease can

cause complete defoliation of infected plants and even death. Control

during the winter and spring months can be accomplished through weekly

applications of one of many fungicides including Daconil and Manzate (1).

The following tests were performed to evaluate the ability of these

chemicals to control anthracnose during the warmer summer months when both

rainfall and temperatures are high and to determine whether or not different

cultivars of Euonymus and different shade levels of the production area

influence severity of anthracnose.

The first test was performed in a shadehouse (50% shade) on ground-

cloth. Plants were grown in 6" plastic pots and irrigated overhead twice

weekly as well as receiving rainfall. Euonymus plants from four cultivars

were included in each of the treatments listed in Table 1 (14 plants per

treatment). Treatments were applied twice on weekly intervals prior to

inoculation with the pathogen and then on weekly intervals for the duration

of the test (5-10-83 to 8-5-83). At the end of the test, the severity of

disease was rated from 1 (no disease) to 5 (lesions on all leaves and stems

blighted).







Anthracnose control during the summer was less successful than that

attempted during the spring months (1). None of the chemicals tested

provided complete control of the disease, although both Dithane M-45 and

Dithane Z-78 both provided some control (Table 1). Two of the compounds

tested appeared to result in more severe disease than the control treat-

ment, MF-654 and C06054. Disease pressure was obviously quite high as

reflected in the high ratings of all treatments including the noninoculated

control.

The second test was also performed using four cultivars of Euonymus

(Table 2). In this test, plants were placed directly in the ground under

different shade levels including 70, 50 and 30% shade. The plants were

arranged in three rows of twelve plants each for a total of 36 plants per

cultivar for each shade level. Plants became naturally infected over the

period of one year. Ratings of each plant for severity of anthracnose

were recorded on 7-20-83 using the same scale as in the previous test.

Both shade level and cultivar of Euonymus influenced the severity of

anthracnose (Table 2). Disease severity was highest on plants grown under

the highest shade level (70%) compared to plants grown under the medium

and low shade levels (Table 2). Similarly, cultivar type also influenced

the severity of anthracnose, with the Microphylla plants less severely

affected than the three other types tested (Table 2).

These results have further characterized the problems faced by

Euonymus producers during the summer months. The 'Gold Spot' cultivar

is the most susceptible to anthracnose and all cultivars are more suscep-

tible when grown under a high shade (70%). Since complete control was

not achieved during these tests, even with Dithane M-45 or Z-78, cultivar






type and shade level should be considered when planting Euonymus to

minimize the need for fungicide applications and maximize their efficacy.




Reference

Chase, A. R. 1983. Some preliminary results on control of Euonymus

anthracnose. Commercial Fern Grower 6(8):1-2.




Table 1. Efficacy of some fungicides for control of
Euonymus anthracnose during the summer.

Rate Severity
Treatment lb/100 gal of disease

Noninoculated
Water -- 2.6 aby
Inoculated
Water --- 3.4 cd
Inoculated
Manzate 200 1.5 2.9 bc
Inoculated
Dithane M-45 1.5 2.7 ab
Inoculated
Zineb 1.5 2.9 bc
Inoculated
Dithane Z-78 1.5 2.2 a
Inoculated
MF-654 2 oz 4.0 e
Inoculated
C0-6054 7 oz 3.9 de

zDisease was rated from 1 (no disease) to 5 (severe
disease.
YMeans were separated using Duncan's New Multiple
Range Test (5% level).












Table 2. Effect of shade level and cultivar type on
severity of Euonymus anthracnose under summer conditions.

Percent shade
Euonymus cultivar 70 50 30

z
E. japonica 'Microphylla' 2.1 1.4 1.4

E. japonica 'Gold Spot' 2.3 1.6 1.8

E. japonica 'Silver Queen' 2.1 1.9 1.5

E. japonica (green) 2.1 1.7 2.0

z Disease was rated from 1 (no disease) to 5 (severe disease).


This report is not meant as an
endorsement of the products named by either
the author or the University of Florida.




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