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Group Title: ARC-A research report - Agricultural Research and Education Center - RH-1983-19
Title: Controlling Corynespora leaf spot of Ficus Benjamina Variegata
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Permanent Link: http://ufdc.ufl.edu/UF00066512/00001
 Material Information
Title: Controlling Corynespora leaf spot of Ficus Benjamina Variegata
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: 1983
 Subjects
Subject: Ficus (Plants) -- Diseases and pests -- Control -- Florida   ( lcsh )
Leaf spots -- Control -- Florida   ( lcsh )
Corynespora -- Control -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00066512
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 - 71261383

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HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida









CONTROLLING CORYNESPORA LEAF SPOT OF

FICUS BENJAMIN VARIEGATA

A. R. Chase
University of Florida, IFAS ; L. '~
Agricultural Research Center popka
ARC-A Research Report RH-83-1

Corynespora cassiicola (Berk. & Cur4.) Wei jssSa-rbSl fIcl t

of several foliage plants, including Aeschynanthus spp. (lipstick vine),

Aphelandra squarrosa cultivars (Zebra plant) and several species of Ficus.

The disease is typified by different symptoms on each of these hosts

(Table 1). On Ficus spp. this disease appears to be more serious on

variegated varieties than solid green varieties; severe leaf abscission

can be common if control measures are not taken.

Several fungicides were tested from 1-18-83 to 4-26-83, for their

efficacy in controlling Corynespora leaf spot of variegated weeping fig

(F. benjamin) which were naturally infected with the pathogen. Plants

were grown in a shadehouse receiving overhead irrigation and fungicides

were applied once a week for three months, after which time the number of

new lesions were recorded. Treatments consisting of 12 plants each

included: 1) water control, 2) Benlate 50 WP, 3) Manzate 200 and 4) Daconil

4.17 F. Rates and results are given in Table 2.

Daconil and Manzate both provided excellent control of Corynespora

leaf spot on variegated Ficus. In contrast, Benlate did not provide any

significant level of disease control in these tests. These results indicate

that under conditions of high disease pressure due to natural inoculum and

overhead irrigation, weekly applications are necessary for good disease

control.


;. .i-









Table 1. Symptoms caused by Corynespora cassiicola on foliage plants.

Plant Lesion size Lesion color Lesion distribution

Aeschynanthus 1-7 mm Tan or purple Scattered all over leaves
Severe leaf drop is common


Aphelandra 2-30 mm Dark brown or On leaf tips and margins
black mainly, also on leaves
touching the potting
medium


Ficus Pinpoint Tan to brown Scattered all over leaves
1-7 mm Severe leaf drop is common





Table 2. Effect of fungicides on severity of Corynespora leaf spot of
Ficus benjamin variegata.

Treatment1 Rate/100 gallons Number lesions/plant

Water -- 20.6 a2
Benlate 50 WP 0.5 lb 16.8 a
Manzate 200 1.5 lb 3.6 b
Daconil 4.17 F 1.5 lb 1.7 b


1Treatments were applied weekly for three months.
2Means were separated by Duncan's New Multiple Range Test (5%).


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