Group Title: CFREC-Apopka research report - Central Florida Research and Education Center-Apopka ; RH-89-8
Title: Aliette 80WP and bacterial disease control
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Permanent Link: http://ufdc.ufl.edu/UF00065875/00001
 Material Information
Title: Aliette 80WP and bacterial disease control
Series Title: CFREC-Apopka research report
Physical Description: 3 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: 1989
 Subjects
Subject: Plants, Ornamental -- Diseases and pests -- Control -- Florida   ( lcsh )
Bactericides -- Testing -- 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: UF00065875
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70552185

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Aliete 80WP and Bacterial Disease Control II. Pseudomonas and Erwinia-

A. R. Chase .,

University of Florida, IFAS
Central Florida Research and Education Center Apopka [V~- 2 1 .1C
CFREC-Apopka Research Report, RH-89-8

Aliette 80WP has been used in the ornamentals industry-for~-contro-'of "". .
diseases caused by Phytophthora and Pythium spp. for the past several
years. Although this fungicide has been shown to affect severity of some
bacterial diseases caused by Xanthomonads, little information regarding
efficacy against Erwinia and Pseudomonas has been reported (2,3,4). The
following report summarizes tests performed to evaluate efficacy of Aliette
80WP compared to other bactericides for control of Erwinia blight of
Philodendron selloum caused by E. chrysanthemi and bacterial leaf spot of
geranium and chrysanthemum caused by Pseudomonas cichorii.

Plants were obtained as rooted cuttings or small seedlings (P. selloum)
and were grown until they reached about 6 to 8 inches in height prior to
treatment. All tests were performed in a greenhouse.

The treatments employed for the Erwinia tests included 2 rates of
Aliette 80WP (2 and 4 lb/100 gal) and two rates of Agri-Strep 21.2%
(streptomycin sulfate at 1 and 2 lb/100 gal) as well as inoculated and
noninoculated control plants. Treatments were applied once 3 or 4 days
before bactericides were applied and twice following inoculation, on weekly
intervals. A suspension of E. chrysanthemi was applied to leaves by
misting with a pump sprayer to the drip point. The number of dead leaves
per plant was determined about 3 days after the final bactericide
application. This test was performed three times during the spring and
summer of 1988.

Neither Aliette 80WP nor Agri-Strep 21.2% gave any control of Erwinia
blight of selloum (Table 1). Past experience with this disease has shown
that although it is very difficult to control, Agri-Strep sometimes can
give a reduction in number of dead leaves per plant (1). Since even
Agri-Strep did not control Erwinia blight in these trials, disease pressure
may have been too severe to evaluate potential for control of Erwinia
blight with Aliette.

The treatments for the Pseudomonas tests included inoculated and
noninoculated controls, as well as Bravo CM 50WP (a combination of
chlorothalonil and copper) at 2 and 4 lb/100 gal, Kocide 101 77WP (1 lb/100
gal) alone and in combination with Manzate 200 80WP (1.5 lb/100 gal) and
Aliette 80WP at (2.5 and 5 lb/100 gal). The test was performed similarly
to the Erwinia tests. Both geranium (Pelargonium hortulanum 'Cameo') and
chrysanthemum (C. morifolium 'Yellow Torch') were tested with Pseudomonas
cichorii. The Tests were performed during the winter of 1988.

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









Number of lesions per chrysanthemum plant was less when Bravo CM or
Kocide was used but actually increased when the lower rate of Aliette was
used (Table 2). Results for geranium showed that none of the bactericides
gave a significant degree of control. However, previous work with this
disease has shown that Kocide can provide good disease control (1). In
another report, Aliette did not control Pseudomonas leaf spot on Ficus
lyrata (2) which is c used by the same pathogen.

These results indicate that Aliette 80WP does not provide adequate
control of Pseudomonas cichorii or Erwinia chrysanthemi despite its
activity against some Xanthomonas diseases on ornamentals.


References

1. Chase, A. R. 1986. Effect of experimental bactericides on three
bacterial diseases of foliage plants. Journal of Environmental
Horticulture 4:37-41.
2. Chase, A. R. 1987. Effect of fosetyl aluminum on severity of two
Xanthomonas leaf spot diseases. Proc. of Symposium on Aliette. Pages
81-86.
3. Chase, A. R. 1987. Update on controlling three bacterial diseases of
foliage plants. Foliage Digest 9(8):1-2.
4. Chase, A. R. 1989. Aliette 80WP and bacterial disease control I.
Xanthomonas. CFREC-Apopka Research Report, RH-89-7.


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Table 1. Efficacy of Aliette 80WP and Agri-Strep 21.2% for control of
Erwinia chrysanthemi on Philodendron selloum.

Mean number dead leaves per plant
Test 1 Test 2 Test 3
Treatmenta lb/100 gal 25 April 25 May 12 Sept

Noninoculated -- 0 ab 0 a 0.6 a
Inoculated -- 13 b 3.6 bc 0.5 a
Aliette 80WP 2 13 b 3.8 c 0.3 a
Aliette 80WP 4 10 b 3.3 bc 0.8 a
Agri-Strep 21.2% 1 12 b 2.2 b 0.5 a
Agri-Strep 21.2% 2 11 b 2.8 bc 0.2 a

aTreatments were applied once 3 or 4 days prior to inoculation and
repeated weekly for a total of 3 applications.
Numbers in the same column followed by the same letter were not
statistically different (DNMRT, P=0.05).


Table 2. Effect of bactericides
morifolium 'Yellow Torch' and
caused by P. cichorii.


on Pseudomonas leaf spot of Chrysanthemum
Pelargonium hortulanum 'Cameo' (geranium)


Mean number lesions per plant
Treatment" lb/100 gal Chrysanthemum Geranium

Noninoculated -- 0.1 ab 0 a
Inoculated --- 3.7 b 1.9 abc
Bravo CM 50WP 2 0.9 a 2.0 abc
Bravo CM 50WP 4 0.8 a 3.0 c
Kocide 101 77WP 1 0.4 a 0.8 a
Kocide 101 77WP and 1
Manzate 200 80WP 1.5 0.8 a 2.1 abc
Aliette 80WP 2.5 6.2 c 2.8 bc
Aliette 80WP 5 3.9 b 1.9 abc

aTreatments were applied once 3 or 4 days prior to inoculation and repeated
weekly for a total of 3 applications.
Numbers in the same column followed by the same letter were not
statistically different (DNMRT, P=0.05).


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