Group Title: CFREC-Apopka research report - Central Florida Research and Education Center-Apopka ; RH-88-11
Title: Some new chemicals for control of Cylindrocladium root and petiole rot of Spathiphyllum
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Permanent Link: http://ufdc.ufl.edu/UF00065884/00001
 Material Information
Title: Some new chemicals for control of Cylindrocladium root and petiole rot of Spathiphyllum
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, IFAS, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1988
 Subjects
Subject: Spathiphyllum -- Diseases and pests -- Control -- Florida   ( lcsh )
Cylindrocladium -- Control   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065884
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70581310

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Some new chemicals for control of Cylindrocladium
root and petiole rot of Spathiphyllum
Central Science A. R. Chase'
Library University of Florida, IFAS
Central Florida Research and Education Center-Apopka
MAR 9 1989 CFREC-Apopka Research Report RH-88-11

University of Elorida
S A research program studying control of Cylindrocladium root and
peti-ole rot of Spathiphyllum spp. has been underway since 1980. During the
past eight years many labeled fungicides and experimental compounds have
been tested for efficacy. Over most of those eight years, Benlate 50WP has
been recommended for control of Cylindrocladium root and petiole rot. More
recently, Terraguard 50WP received a Section 18 label in 1987 for use in
Florida on this disease. New compounds continue to be tested for efficacy
as they are made available. The following report summarizes tests
performed with three new fungicides not currently labeled for this use.
Plants obtained from commercial producers were established in
steam-treated potting medium consisting of Canadian peat and pine bark
(1:1, by volume) which was amended with 10 lbs Osmocote 19:6:12, 7 lbs
dolomite, and 1 lb Micromax per cubic yard of medium. Plants were
maintained in a greenhouse receiving approximately 1500 ft-c. of light with
temperatures ranging from 60 to 900F. Tests included noninoculated and
inoculated control plants. Fungicide treatments were applied weekly for a
total of 6 or 7 weeks. Drench volume was adjusted to approximately 1
pint/ft surface area. Plants were inoculated with Cylindrocladium
spathiphylli five days after the first fungicide application and disease
severity was visually rated as the estimated percentage of plant foliage
showing disease symptoms.
Treatments are given in the tables. Spotless 25WP (Chevron Chemical
Company) provided excellent control of the disease in the first test (Table
2). Benlate 50WP gave excellent control as well. Terraguard 50WP and
C2338 10EC (UniRoyal Chemical Co., Inc.) provided excellent control of
Cylindrocladium root and petiole rot in the second test (Table 2). G696 4F
(also from UniRoyal) provided some control but was better than Benlate 50WP
only when applied at 1.2 ml/gallon (Table 2). The difference in results
obtained with Benlate 50WP is apparently due to differences in the
temperature of the potting medium. Benlate 50WP provides excellent control
of Cylindrocladium root and petiole rot when applied at relatively low
temperatures but does not give good control when soil temperatures reach
750F or higher. This is probably due to the increased disease pressure at
higher soil temperatures.
Chemical company interest in labeling compounds for ornamentals has
increased during the past two years and we may look forward to new
registrations for such serious diseases as Cylindrocladium root and petiole
rot.

1Associate Professor of Plant Pathology, Central Florida Research and
Education Center Apopka, 2807 Binion Rd, Apopka, FL 32703.
This research was supported in part through grants from UniRoyal and
Chevron chemical companies.












Table 1. Efficacy of Spotless 25WP for control of Cylindrocladium root and
petiole rot of Spathiphyllum.

Treatment Rate/gallon Mean disease severity
24 March 1988 31 March 1988

Noninoculated control 1 a9 3 a
Inoculated control 17 b 69 b
Benlate 50WP 4.5 g 1 a 8 a
Spotless 25WP 2.3 g 2 a 7 a
Spotless 25WP 4.5 g 0 a 4 a
Spotless 25WP 9.1 g 0 a 8 a

XMean disease severity for 10 plants each was visually estimated as the
percentage of plant foliage showing disease symptoms.
YNumbers in the same column followed by the same letter were not
statistically different using Duncan's New Multiple Range Test (P=0.05).


Table 2. Efficacy of experimental fungicides for control of
Cylindrocladium root and petiole rot of Spathiphyllum.

Treatment Rate/gallon Mean disease severity"
20 May 1988 27 May 1988

Noninoculated control 0 aY 0 a
Inoculated control 39 b 60 d
Benlate 50WP 2.3 g 4 a 26 c
C2338 10EC 4.2 ml 2 a 3 ab
G696 4F 0.6 ml 8 a 18 bc
G696 4F 1.2 ml 2 a 12 abc
Terraguard 50WP 2.3 g 0 a 3 ab
Terraguard 50WP 4.5 g 2 a 4 ab

XMean disease severity for 10 plants each was visually estimated as the
percentage of plant foliage showing disease symptoms.
yNumbers in the same column followed by the same letter were not
statistically different using Duncan's New Multiple Range Test (P-0.05).


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