Group Title: CFREC-Apopka research report - Central Florida Research and Education Center-Apopka ; RH-93-3
Title: Review of fungicides for control of Phytophthora and Pythium diseases on potted ornamentals
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Permanent Link: http://ufdc.ufl.edu/UF00065848/00001
 Material Information
Title: Review of fungicides for control of Phytophthora and Pythium diseases on potted ornamentals
Series Title: CFREC-Apopka research report
Physical Description: 4 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Central Florida Research and Education Center--Apopka
Publisher: University of Florida, IFAS, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1993
 Subjects
Subject: Plants, Ornamental -- Diseases and pests -- Control -- Florida   ( lcsh )
Phytophthora -- Control -- Florida   ( lcsh )
Pythium -- Control -- Florida   ( lcsh )
Fungicides -- Testing -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 3-4).
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065848
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70274052

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Agricultural Sciences and should be
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( 9- 3 Review of Fungicides for Control of Phytophthora and : r Science
Pythium Diseases on Potted Ornamentals i h r

A. R. Chase1 3

University of Florida, IFAS, l-p.rcifv of Florida
Central Florida Research and Education Center Apopka
CFREC-Apopka Research Report, RH-93-3


Some of the most common and costly diseases of ornamental plants are caused by
Phytophthora and Pythium spp. These diseases can affect cuttings, seedlings, and all other
stages of the crops. Pythium spp. primarily attack plant roots. Diseases caused by Phytophthora
can occur on any part of the plant. In Florida, aerial leaf spots caused by Phytophthora
parasitica occur on a number of ornamental crops although stem rots are probably the most
common problems. The roots of some types of plants, such as schefflera (Brassaia
actinophylla), are almost always infected with Pythium spp. despite preventative use of
fungicides.

Fungicides remain an important method to control losses due to Phytophthora and
Pythium spp. The following review was developed to summarize the fungicides which are
available for ornamentals to assist in control of Phytophthora and Pythium spp. The table gives
a summary of studies performed at the CFREC-Apopka since 1981.

Currently, there are relatively few fungicides available for controlling Phytophthora or
Pythium. Propamocarb (Previcur N), etridiazole (Terrazole and Truban), fosetyl aluminum
(Aliette), and metalaxyl (Subdue) have been tested on one or more ornamental crops. All of
these fungicides are applied to the potting medium with the exception of Aliette which can be
applied as a drench or a foliar spray. Although some differences in efficacy occur from plant
to plant, some general conclusions can be drawn.

The best control of Phytophthora and Pythium spp. on ornamentals occurs when Subdue
is applied as a soil drench. Aliette drenches are nearly as effective and sometimes more
effective than Subdue. When Aliette is applied as a foliar spray, efficacy is usually a little lower
than a drench of either Subdue or Aliette. Terrazole and Truban drenches can also be effective
but are usually a little less effective than Subdue drenches. It is perhaps a little confusing to find
Subdue listed as both "excellent" and "good" in the table for a single plant. This variability
in the degree of control can be explained by the effect of disease pressure since under very
severe conditions a fungicide generally does not work as well as it can under more normal
conditions. Overall, Subdue gives good to excellent control of these diseases depending on
disease pressure. Only a few tests were performed with Previcur N but they showed that this
compound had a significantly lower efficacy than the other fungicides. This conclusion has been


'Professor of Plant Pathology, University of Florida, Central Florida Research and Education
Center Apopka, 2807 Binion Rd., Apopka, FL 32703.








supported by researchers working on other ornamentals.


This information may allow growers to choose the best fungicide for Phytophthora and
Pythium spp. Schefflera requires preventative fungicide applications since Pythium root rot is
common on all stages. Other diseases can be controlled following diagnosis of the problem.
Finally, some diseases, such as Phytophthora aerial blight on vinca are rarely controlled with
any fungicide treatment and cultural control methods must be used for these diseases.


Table 1.


Summary of fungicide tests for control of Phytophthora and Pythium diseases on
some ornamentals.


Plant Disease Excellent Good Poor
control control control
Aglaonema Pythium Aliette drench Aliette spray Previcur N
root rot Subdue drench Captan drench drench
Truban drench
Aphelandra Phytophthora Aliette drench Aliette spray
(zebra plant) stem rot Subdue drench Subdue drench
Begonia Pythium Subdue drench Aliette drench
root rot Terrazole drench Aliette spray
Brassaia Pythium Aliette drench Aliette spray Aliette spray
(schefflera) root rot Subdue drench Subdue drench Previcur N
Terrazole drench drench
Truban drench Truban drench
Catharanthus Phytophthora Aliette drench Subdue drench
(vinca) aerial blight Subdue drench
Epipremnum Pythium Aliette drench Aliette spray
(pothos) root rot Subdue drench Subdue drench
Terrazole
drench
Peperomia Pythium Subdue drench Subdue drench
root rot
Spathiphyllum Pythium Aliette drench Subdue drench
root rot Aliette spray



















REFERENCES

1. Chase, A. R. 1981. Evaluation of Several Pesticides for Control of Damping-off of
Schefflera Seeds. Agricultural Research Center, Univ. of Fl. ARC-Apopka Research
Report RH-81-15.

2. Chase, A. R. 1982. Influence of Soil Drench Fungicides on Rooting of Two Foliage
Plants. Agricultural Research Center, Univ. of Fl., ARC-Apopka Research Report
RH-82-12.

3. Chase, A. R. and L. S. Osborne. 1982. Pesticide Evaluations in Support of
Registrations on Tropical Foliage Plants. Agricultural Research Center, Univ. of Fl.,
ARC-Apopka Research Report RH-82-18.

4. Chase, A. R. 1984. Subdue 5S Phytotoxicity on Three Foliage Plants. Agricultural
Research and Education Center, Univ. of Fl., AREC-Apopka Research Report
RH-84-21.

5. Chase, A. R. 1984. Some New Soil Fungicides for Control of Pythium Root Rot of
Foliage Plants. Agricultural Research and Education Center, Univ. of Fl.,
AREC-Apopka Research Report RH-84-23.

6. Chase, A. R., D. D. Brunk, and B. L. Tepper. 1985. Fosetyl Aluminum Fungicide for
Controlling Pythium Root Rot of Foliage Plants. Proc. Fla. State Hort. Soc.
98:119-122.

7. Chase, A. R. and R. T. Poole. 1985. Irrigation Frequency and SubdueR Rate Affect
Pythium Root Rot of Pothos. Agricultural Research and Education Center, Univ. of Fl.,
AREC-Apopka Research Report RH-85-14.

8. Chase, A. R. 1986. Fungicide Trials of Foliage Plants Summary 1986. Agricultural
Research and Education Center, Univ. of Fl., AREC-Apopka Research Report
RH-86-21.


Regardless of the pesticide or mixture of pesticides used, it is strongly
recommended that the effects be evaluated on a few plants, under your particular conditions
before treating all plants.
Mention of a commercial or proprietary product or a pesticide in this paper does
not constitute a recommendation by the authors, nor does it imply registration under FLFRA
as amended.








9. Chase, A. R. 1988. Efficacy of Aliette 80WP in Controlling Pythium Root Rot of
Begonia and Phytophthora Stem Rot of Aphelandra. Central Florida Research and
Education Center, Univ. of Fl., CFREC-Apopka Research Report RH-88-5.

10. Chase A. R. 1988. New Fungicides or Fungicide Uses for Foliage Plants 1988.
Proceedings of the 4th Conference on Insect and Disease Management on Ornamentals.
Society of American Florists. pp. 148-152.

11. Chase, A. R. 1988. Chemicals for Control of Pythium Root Rot 1988. Central
Florida Research and Education Center, Univ. of Fl., CFREC-Apopka Research Report
RH-88-13.

12. Chase, A. R. 1989. Fungicide Trials for Cylindrocladium, Helminthosporium, Pythium
and Rhizoctonia Diseases of Ornamentals 1989. Central Florida Research and
Education Center Univ. of Fl., CFREC-Apopka Research Report RH-89-15.

13. Chase, A. R. 1990. 1990 Fungicide Trials for Control of Alternaria,
Helminthosporium, Phytophthora and Rhizoctonia Diseases of Ornamentals. Central
Florida Research and Education Center, Univ. of Fl., CFREC-Apopka Research Report
RH-90-25.

14. Chase, A. R. and T. A. Mellich. 1992. Fungicides Tests for Control of Phytophthora
and Pythium Diseases of Ornamentals. Central Florida Research and Education Center,
Univ. of Fl., CFREC-Apopka Research Report, RH-92-9.




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