Studies with labeled fungicide...
 Studies with experimental...

Group Title: AREC-A research report - Agricultural Research and Education Center - RH-1984-11
Title: Fungicide evaluations in support of registrations on foliage plants, June 1982 to February 1984
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00066549/00001
 Material Information
Title: Fungicide evaluations in support of registrations on foliage plants, June 1982 to February 1984
Series Title: AREC-A research report
Physical Description: 6 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Agricultural Research and Education Center (Apopka, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1984
Subject: Fungicides -- Testing -- Florida   ( lcsh )
Foliage plants -- Diseases and pests -- Control -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
Funding: AREC-Apopka research report ;
 Record Information
Bibliographic ID: UF00066549
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 - 71315318

Table of Contents
    Studies with labeled fungicides
        Page 1
        Page 2
    Studies with experimental fungicides
        Page 3
        Page 4
        Page 5
        Page 6
Full Text


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

site maintained by the Florida
Cooperative Extension Service.

Copyright 2005, Board of Trustees, University
of Florida

JUNE 1982 to FEBRUARY 1984

A. R. Chase
University of Florid ,~ 5
Agricultural Research and Ed ca ~T nte{3RAY
AREC-A Research Repor RH-84-11
JANI 28 '985
Fungicide evaluations conducted during th past 20 months involve both
established-and experimental compounds. In ea foA( ,-ifu g tested
were used at recommended rates and intervals as we -at- hig__ t.% to
test for possible phytotoxicity. Most of the trials were conducted to
evaluate the efficacy of the compounds in controlling specific pathogens on
specific plants. Several other efficacy and phytotoxicity trials conducted
during this period have been published previously and are not included in
this report. These are listed in the reference section.
Studies with Labeled Fungicides

Banrot 40WP and Subdue 2E
Objective Test the efficacy and phytotoxicity of these two soil drench
fungici.des-in root rot diseases under interiorscape conditions.

Need Very few fungicides are registered for use in the interiorscape at
this time and tests are required for labeling.

Methods Plants were grown to a finished size in the greenhouse before moving
into conditioning rooms. Plants were treated with the fungicides after
inoculation with Pythium splendens. The following treatments were employed:
Banrot at 2.4, 4.8, or 9.6 oz/100 gal, Subdue at 0.3, 0.6 or 1.2 oz/100 gal,
inoculated and noninoculated controls. The fungicides were applied three
times on two month intervals and disease, phytotoxicity and plant quality
were rated one month after the final application.

Results Pothos (Epipremnum aureum) were tested with Banrot 40WP. No phyto-
toxicity occurred and application of the Banrot resulted in higher root
weights and less root rot than nontreated plants. Polyscias fruticosa
(Ming aralia) were also treated with Banrot and showed no signs of phyto-
toxicity even at the highest rate, although no clear benefit from the Banrot
application was noted on this plant. The same results were obtained for
Dracaena'marginata treated with Banrot as with Ming aralia. Areca palms
(Chrysalidocarpus lutescens) were treated with both fungicides. Plants
treated with Banrot showed no signs of either root rot or phytotoxicity.
The palms treated with Subdue also had healthy appearing roots and no signs
of phytotoxicity occurred. Ficus benjamin (Weeping fig) were treated with
Subdue and showed no adverse effects.

1Associate Professor, Plant Pathology.

Conclusions Subdue 2E appears safe to use on the following plants in the
interiorscape: Weeping fig and Areca palm. Banrot 40WP appears safe
to use in the interiorscape on the following plants as well: D. marginata,
Ming aralia and Pothos.

Daconil 4.17F 1
Objective Determine the ability of Daconil to control Myrothecium leaf spot of
several foliage plants.

Need Myrothecium leaf spot is a serious foliar problem of many foliage plants
and evaluation of all possible fungicides for control of the disease will
allow rotation of these chemicals to avoid phytotoxicity, excessive residues
and possible resistance.

Methods Plants were treated with Daconil at one of the following rates: 2, 4 or
8 pt/100 gal. Inoculated and noninoculated controls were also included.
Plants were treated once with the fungicide prior to inoculation with conidia
of M. roridum and then retreated once one week later. The number of leaf
spots and any phytotoxicity were recorded two to three weeks after inoculation.

Results Daconil effectively controlled Myrothecium leaf spot on each of the plants
tested with the 4 pt/100 gal rate providing excellent control. All rates
tested were safe for use on the following plants: Aphelandra squarrosa (Zebra
plant), Aeschynanthus pulcher (Lipstick vine), Aglaonema commutatum (Silver
Queen), Dieffenbachia maculata (Perfection), and Peperomia repii.

Conclusions Recommendations have been made to the parent company to pursue label
for Myrothecium leaf spot of some foliage plants.

Daconil 4.17 F 2
Objectives Determine the safety of using Daconil on several foliage plants.

Need Foliage plants are subject to a multitude of fungal foliar diseases and
since Daconil is a relatively broad spectrum fungicide, expansion of its label
would prove beneficial in disease control.

Methods The following treatments were included: water control, and Daconil at 2,
4, or 8 pt/100 gal. Treatments were applied on weekly intervals for a total
of 7 applications prior to evaluating plants for signs of phytotoxicity.

Results All rates of Daconil were used safely on the following plants: Syngonium
podophyllum (Nephthytis) and Araucaria heterophylla (Norfolk Island pine).
Slight chlorosis of new leaves of Schlumbergera truncata (Christmas cactus)
occurred on plants treated with Daconil. Polyscias fruticosa (Ming aralia)
showed some signs of stunting at the growing points when plants were treated
with the fungicide. Gynura aurantiaca (Purple passion vine) showed some
reduced growth when treated with the 4 pt rate, but no phytotoxicity when
treated with the 2 pt rate.

Conclusions Daconil can be safely used on Norfolk Island pine and Nephthytis
but should be tested or not used on Christmas cactus, Purple passion vine
and Ming aralia.

Daconil 4.17F 3
Objective Evaluate Daconil for control of Alternaria leaf spot of both green
and variegated Pittosporum tobira.

Need Alternaria leaf spot
commercial cut foliage

of Pittosporum has been a serious problem for the
producer, the woody ornamental producer and the

Methods The following treatments were included: inoculated and noninoculated
controls and Daconil at 2, 4, or 8 pt/100 gal rates. Plants were arti-
ficially inoculated two separate times following fungicide applications.
Treatments were applied a total of 7 times on weekly intervals.

Results- Daconil provided good control of Alternaria leaf spot even at the 2 pt/
100 gal rate. Some leaf cupping occurred when the Daconil was used at the
8 pt rate.

Conclusions It is likely that Daconil can be used at the 2 pt rate for safe
and effective control of Alternaria leaf spot of Pittosporum.

Studies with Experimental Fungicides

Activities of some experimental compounds.

Name Manufacturer

Efficacy spectrum

Benodanil Mallinckrodt Rhizoctonia
MF-688 Mallinckrodt Rhizoctonia, Pythium,
MF-689 Mallinckrodt same as above
CO-6054 Wacker Chemie Botrytis, Alternaria
Helminthosporium and

Ornalin 50WP and Benodanil
Objective Evaluate these compounds for control of several leaf spot diseases
of foliage plants.

Need New compounds have the potential for superior disease control, reduced
residues, and reduced phytotoxicity and should be evaluated for these

Methods The following treatments were included: inoculated control, non-
inoculated control, Ornalin 50 WP at 1.5 or 3.0 lb/100 gal, MF-667 at
0.75 or 1.5 lb/100 gal, MF-654 (Benodanil) at 0.37 or 1.5 lb/100 gal and
Daconil 4.17F at 4 pt/100 gal. In each test, plants were inoculated prior
to the first application of the treatments. A total of seven weekly
applications was made. The following plant/disease combinations were
tested: Dracaena marginata/Fusarium leaf spot and Areca palm/Bipolaris
leaf spot.

Results Dracaena/Fusarium leaf spot All fungicide treatments provided
excellent control of Fusarium leaf spot with the Daconil treatment and the
higher rates of Ornalin and MF-667 providing the best control. Both
Ornalin and the MF-667 caused severe stunting and chlorosis of the new
growth of this Dracaena. Areca palm/Bipolaris leaf spot Daconil and the
higher rates of both Ornalin and MF-667 provided excellent control of this
disease without any signs of phytotoxicity. Benodanil (MF-654) was safely
used but did not control the disease.

Conclusions Daconil provided the best control of Fusarium without phyto-
toxicity. Benodanil (MF-654) also provided good control without phyto-
toxicity. Daconil and Ornalin can be used for effective safe control of
Areca palm leaf spot.

MF-688 and MF-689
Objective Evaluate these two soil fungicides for ability to control Pythium
root rot of Philodendron scandens oxycardium and Epipremnum aureum.

Need New formulations of presently available fungicides are important to
provide alternatives and potentially increase their efficacy. In addition,
combination products may allow for easier fungicide application with broad
spectrum control.

Methods The following treatments were included: inoculated control, noninoculated
control, MF-688 at 4, 8, or 12 oz/100 gal, MF-689 at 8 oz/100 gal, Banrot 40WP
at 8 oz/100 gal, MF-654 (Benodanil) at 4 oz/100 gal and Truban 30WP at 4 oz/
100 gal. Treatments were applied three times on two month intervals with in-
oculation occurring one week after the first application.

Results Truban 30WP provided the best control of the Pythium root rot on both
plants tested with no phytotoxicity. None of the fungicides caused phyto-
toxicity at the rates used. MF-688 also provided good root rot control when
used at the higher rate.

Conclusions Of the products tested, Truban 30WP provided the best control with
Benodanil (MF-654) providing no control at all.

MF-686 Banrot 8G
Objective Test the new formulation of Banrot for control of Pythium sp. on both
Philodendron scandens oxycardium and Epipremnum aureum.

Need Provide information on a new more concentrated formulation of Banrot in a
granular form.

Methods The following treatments were included: inoculated control, noninocu-
lated control, MF-686 at 8.4, 12.6 or 16.8 g/ftO, and Truban 5G at 10.5 g/
ft3. The fungicides were incorporated into previously steam sterilized
medium prior to planting with rooted cuttings. Evaluations occurred about
2 months after the plants were potted.

Results No signs of phytotoxicity occurred on any plants in any treatments.
MF-686 provided the best control of Pythium root rot of Philodendron and
Pothos when used at the highest rate.

Conclusions The use of a new granular Banrot formulation appears to be effective
and safe on these two plants.

CO-6054 50WP
Objective Test this fungicide for control of several fungal leaf spot diseases
of foliage plants. The fungicide is similar to both Ornalin and Chipco
26019 which are currently labeled for foliage plants.

Need Explore the potential of CO-6054 for providing an alternative treatment
for many foliar diseases.

Methods The following treatments were included: noninoculated control, inocu-
lated control, CO-6054 at either 6.7 or 9.8 oz/100 gal, and Ornalin 50WP at
8 oz/100 gal. This test was performed on Areca palm with Bipolaris leaf spot,
Schefflera with Alternaria leaf spot, Dieffenbachia with Myrothecium leaf
spot, Dracaena with Fusarium leaf spot and Ivy with Rhizoctonia aerial blight.
Plants were inoculated once one week after the first fungicide application
with conidia of the appropriate pathogen. Treatments were applied four or
five times on one or two week intervals.

Results Both rates of CO-6054 provided excellent control of each disease except
Fusarium leaf spot for which moderate control was achieved. Phytotoxicity
occurred on several of the hosts. Scheffleras treated with CO-6054 had
severely deformed new leaves even after one application of the fungicide.
Dieffenbachias reacted similarly with moderate leaf deformity. Ivy plants
again showed severe distortion of the terminal runners and growth appeared
to more or less cease. The chemical was safely used on Dracaena and Areca

Conclusions The parent company is reformulating the product to reduce phyto-
toxicity and the chemical will be tested when available..

Additional References

1. Chase, A. R. 1983. Euonymus anthracnose Influence of cultivars, shade
level and increased disease pressure. Nurseryman's Digest 17(11):80.

2. Chase, A. R. 1983. Controlling Corynespora leaf spot of Ficus benjamin
variegata. Foliage Digest 6(11):10.

3. Chase, A. R. 1983. Attempts to control Erwinia blight of Philodendron
selloum with some unusual compounds. Foliage Digest 6(10):14-15.

4. Chase, A. R. 1983. Some preliminary results on control of Euonymus
anthracnose. Commercial Fern Grower 6(8):1-2.

5. Chase, A. R. 1983. Control of Cylindrocladium root rot of Spathiphyllum
with chemicals. Foliage Digest 6(10):1-3.

6. Chase, A. R. 1983. Controlling brown leaf spot of Yucca. ARC-Apopka
Research Report RH-83-24.

7. Chase, A. R. and R. T. Poole. 1982. Suggestions for controlling Areca
palm leaf spot with chemicals. Foliage Digest 5(12):11.

8. Chase, A. R. and L. S. Osborne. 1983. Effects of Oxamyl insecticide on
fungal leaf spot diseases of foliage plants. Florida Foliage 9(5):64-66.

9. Chase, A. R. and L. S. Osborne. 1984. Interaction of Safer's Insecticidal
Soap with some leaf spot diseases of foliage plants. Foliage Digest 7(1):


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