| Material Information
||Controlling Corynespora leaf spot of Ficus Benjamina Variegata
||ARC-A research report
||2 p. : ; 28 cm.
||Chase, A. R ( Ann Renee )
Agricultural Research Center (Apopka, Fla.)
||University of Florida, IFAS, Agricultural Research Center-Apopka
||Place of Publication:
||Ficus (Plants) -- Diseases and pests -- Control -- Florida ( lcsh )
Leaf spots -- Control -- Florida ( lcsh )
Corynespora -- Control -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||Florida Historical Agriculture and Rural Life
|Table of Contents
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not reflect current scientific knowledge
or recommendations. These texts
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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
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Copyright 2005, Board of Trustees, University
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
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
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%).