Group Title: CFREC-Apopka research report
Title: Fungicides for Rhizoctonia control on ornamentals
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 Material Information
Title: Fungicides for Rhizoctonia control on ornamentals 1993 results
Series Title: CFREC-Apopka research report
Physical Description: 2 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Central Florida Research and Education Center--Apopka
Publisher: University of Florida, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1993
Subject: Rhizoctonia -- Control -- Florida   ( lcsh )
Plants, Ornamental -- Diseases and pests -- Control -- Florida   ( lcsh )
Fungicides -- Testing -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065320
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70152210

Full Text
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_ Central Florida Research
UFLORIDTA Oand Education Center

Institute of Food and Agricultural Sciences Research Report

Fungicides for Rhizoctonia Control on Ornamentals
-1993 Results

,.p 0 1994
A. R. Chase'
CFREC-Apopka Research Report, RH-93-14 U-niversity of Florida

Fungicides continue to be an important part of ornamental plant production.
Preventative control of Rhizoctonia diseases frequently relies on use of fungicides on many
ornamental crops. Rhizoctonia spp. are soilborne fungi that commonly cause aerial blight
and stem rot. The fact that the pathogen occurs in the potting medium but causes above
ground diseases makes the application site for a fungicide critical. Soil drenches are more
effective against diseases of roots while foliar sprays are generally more effective against
aerial blights and stem rots. The following table summarizes results of fungicide tests for
control of Rhizoctonia diseases of ornamentals conducted in 1993.

Many of the fungicides were tested on a variety of ornamentals. In most tests with
thiophanate methyl compounds (Domain, Cleary and Topsin M), good to excellent disease
control was achieved. PCNB (Terraclor) and triflumizole (Terraguard) have been found to
give excellent control on some plants (vinca and spathiphyllum) but only good control on
others (pothos and impatiens). Iprodione (Chipco 26019) gave excellent control of
Rhizoctonia stem rot on vinca when used as a drench and Rhizoctonia stem rot on
impatiens when used as a spray. Both maneb (Maneb) and mancozeb (Penncozeb) gave
good control of Rhizoctonia diseases of pothos and English ivy with excellent control on
Boston fern. The experimental compound from Ciba (CGA-17506) gave excellent control
of Rhizoctonia diseases on vinca and impatiens.

Comparisons of these results to those of previous years indicate that on many
ornamentals a large number of highly effective alternatives continue to be available for
Rhizoctonia control. Be sure to read labels, check for legal uses and remember to spray
fungicides when the disease affects leaves and stems and drench them when the disease
affects roots.

1Professor of Plant Pathology, Central Florida Research and Education Center Apopka, 2807 Binion Rd.,
Apopka, FL 32703.

The Institute of Food and Agricultural Sciences is an Equal Employment Opportunity Affirmative Action Employer authorized to provide research, educational
information and other services only to individuals and institutions that function without regard to race, color, sex, age, handicap or national origin.

able 1. Fungicides for control of Rhizoctonia spp. on some ornamentals.
Excellent Some
lant Disease control control
'atharanthus Rhizoctonia CGA-17506 drench
Vinca) stem rot Chipco 26019 drench

hos) petiole rot Cleary drencl
Maneb drench
Penncozeb drench
era Rhizoctonia Benlate spray Topsin M spray
glish ivy) leaf spot Cleary spray
Penncozeb spray
Maneb spray
atiens Rhizoctonia CGA-17506 drench Terraclor drench
stem rot Terraclor drench Terraguard drench
Chipco 26019 drench
hrolepis Rhizoctonia Cleary spray
ston fern) aerial blight Topsin M spray
Penncozeb spray
Maneb spray
)sporum Rhizoctonia Domain spray Terraguard spray
aerial blight
thiphyllum Rhizoctonia Terraclor spray
petiole rot Terraguard spray

Regardless of the pesticide or mixture of pesticides used, it is strongly
-commended 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
oes not constitute a recommendation by the authors, nor does it imply registration
under FIFRA as amended.

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