| Material Information
||Fungicides for Rhizoctonia control on ornamentals 1993 results
||CFREC-Apopka research report
||2 p. : ; 28 cm.
||Chase, A. R ( Ann Renee )
Central Florida Research and Education Center--Apopka
||University of Florida, Central Florida Research and Education Center-Apopka
||Place of Publication:
||Rhizoctonia -- Control -- Florida ( lcsh )
Plants, Ornamental -- Diseases and pests -- Control -- Florida ( lcsh )
Fungicides -- Testing -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
| Record Information
||University of Florida
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 70152210
_ Central Florida Research
3i UNIVERSITY OF
UFLORIDTA Oand Education Center
Institute of Food and Agricultural Sciences Research Report
Fungicides for Rhizoctonia Control on Ornamentals
,.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
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.
COOPERATIVE EXTENSION WORK IN AGRICULTURE, HOME ECONOMICS, STATE OF FLORIDA, IFAS, UNIVERSITY OF FLORIDA,
U.S. DEPARTMENT OF AGRICULTURE. AND BOARDS OF COUNTY COMMISSIONERS COOPERATING.
able 1. Fungicides for control of Rhizoctonia spp. on some ornamentals.
lant Disease control control
'atharanthus Rhizoctonia CGA-17506 drench
Vinca) stem rot Chipco 26019 drench
hos) petiole rot Cleary drencl
era Rhizoctonia Benlate spray Topsin M spray
glish ivy) leaf spot Cleary 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
)sporum Rhizoctonia Domain spray Terraguard spray
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.