Group Title: AREC-A research report - Agricultural Research and Education Center-Apopka ; RH-86-2
Title: Efficacy of Chipco 26019 flowable and wettable powder formulations for control of Alternaria and Drechslera leaf spots
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Permanent Link: http://ufdc.ufl.edu/UF00065959/00001
 Material Information
Title: Efficacy of Chipco 26019 flowable and wettable powder formulations for control of Alternaria and Drechslera leaf spots
Series Title: AREC-Apopka research report
Physical Description: 2 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 Fla
Publication Date: 1986
 Subjects
Subject: Fungal diseases of plants -- Control -- Florida   ( lcsh )
Leaf spots -- Control -- Florida   ( lcsh )
Foliage plants -- Diseases and pests -- Control -- Florida   ( lcsh )
Pesticides -- Application -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 2).
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065959
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70923185

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Efficacy of Chipco 26019 Flowable and Wettable Powder rntal Science
Formulations for Control of Alternaria and Drechsler Leaf po Rrary
alirary
A. R. Chase
University of Florida, IFAS OCTF 4 1987
Agricultural Research and Education Center A opka
AREC-Apopka Research Report RH-86-2 Ui -.,;' of Forida

Chipco 26019 50WP (iprodione) has been shown effective in controlling
several foliar diseases of foliage plants including Alternaria leaf spot of
Schefflera (1) and Helminthosporium (Exserohilum) leaf spot of Areca palm
(2). In addition, this pesticide has a broad label for Botrytis control on
many ornamentals and may be used on a variety of crops as a soil drench to
control Rhizoctonia diseases. A flowable formulation of Chipco 26019 is
currently being considered for the ornamentals market. The following tests
were performed to compare these formulations of Chipco 26019 for control of
Alternaria leaf spot of Brassaia actinophylla (schefflera) and Schefflera
arboricola (dwarf schefflera) and Drechslera leaf spot of Maranta
leuconeura erythroneura (red maranta).

All plants were obtained from commercial producers and grown on a
greenhouse bench where maximum light levels were approximately 1000 ft-c
and temperatures were maintained between 60 and 85F. Ten plants of each
species were used for each of the following treatments: 1) noninoculated,
control; 2) inoculated, control; 3) inoculated, sprayed with Chipco 2F at
1/2 lb/100 gal: 4) inoculated, sprayed with Chipco 2F at 1 lb/100 gal; 5)
inoculated, sprayed with Chipco 50WP at 1/2 lb/100 gal; and 6) inoculated,
sprayed with Chipco 50WP at 1 lb/100 gal. Fungicides were applied on the
following dates: 12-20-85, 1-3-86, and 1-10-86. Plants were artificially
inoculated with a conidial suspension of a pathogen (Alternaria panax for
Schefflera and Dwarf schefflera and Drechslera setariae for Marnta) on
12-23-85. Plants were misted starting 24 hr before inoculation and
continuing until 1 wk after the final fungicide application when disease
severity was rated.

Excellent control of Alternaria leaf spot on schefflera was achieved
with both rates of both formulations of Chipco 26019 (Table 1). In
contrast, slight differences were seen in efficacy at the lower rate on
dwarf schefflera with the same disease. In this case, optimal control was
achieved with the wettable powder at the 1/2 lb rate. Both formulations of
Chipco 26019 gave excellent control at both rates of Drechslera leaf spot
of maranta.


Associate Professor of Plant Pathology, Agricultural Research and
Education Center, 2807 Binion Rd., Apopka, FL 32703.








These tests show that for two of the three hosts the flowable
formulation of Chipco 26019 provided the same degree of control of
Alternaria or Drechslera leaf spot as the wettable powder formulation. In
addition, this is the first report of efficacy of Chipco 26019 on
Drechslera leaf spot of Maranta. Helminthosporium leaf spot of Areca palm
can be caused by either Exserohilum rostratum or D. setariae. A previous
report showed that Chipco 26019 can control E. rostratum on Areca palm.
This report indicates that Chipco 26019 may be effective also on D.
setariae on Areca palms.


References


1. Chase, A. R. 1984. Alternaria leaf spot control with chemicals. Foliage
Digest 7(11):3.

2. Chase, A. R. 1985. 1984 Fungicide trials for leaf spot diseases of
foliage plants. Nurserymen's Digest 19(10):70-72.


Table 1. Efficacy of Chipco 26019 formulations for controlling Alternaria
leaf spot of Schefflera and Dwarf schefflera and Drechslera leaf spot
of Maranta.


Number of leaf spots

Alternaria Drechslera
Dwarf
Treatment lbs/100 gal. Schefflera Schefflera Maranta


Noninoculated --0 az 0 a 0 a
Inoculated ---- 9.4 b 31.0 c 14.5 c
Chipco 2F 1/2 7.0 a 10.0 b 6.2 b
Chipco 2F 1 3.5 a 7.0 ab 2.0 ab
Chipco 50WP 1/2 5.4 a 4,0 a 6.0 b
Chipco 50WP 1 6.6 a 7.5 ab 4.7 ab


ZNumbers given are the mean number of
Means in the same column followed by
significantly different according to
the 5% level of significance.


leaf spots per plant for 10 plants.
the same letter were not
Duncan's New Multiple Range Test at




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