Group Title: Research report - Ft. Pierce Agricultural Research and Education Center ; FTP-87-1
Title: Fosetyl-A1 has no effect on bacterial wilt of tomato
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Permanent Link: http://ufdc.ufl.edu/UF00055968/00001
 Material Information
Title: Fosetyl-A1 has no effect on bacterial wilt of tomato
Series Title: Ft. Pierce AREC research report
Physical Description: 3 leaves : ; 28 cm.
Language: English
Creator: Sonoda, Ronald M
Gould, Ann B
Agricultural Research and Education Center (Fort Pierce, Fla.)
Publisher: University of Florida, Insititute of Food and Agricultural Sciences, Agricultural Research and Education Center
Place of Publication: Fort Pierce Fla
Publication Date: [1987]
 Subjects
Subject: Tomatoes -- Diseases and pests -- Florida   ( lcsh )
Pesticides -- Florida   ( lcsh )
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (leaf 3).
Statement of Responsibility: R.M. Sonoda and Ann Brooks Gould.
General Note: Caption title.
General Note: "July 1987."
 Record Information
Bibliographic ID: UF00055968
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 67108737

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not reflect current scientific knowledge
or recommendations. These texts
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Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
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Copyright 2005, Board of Trustees, University
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/00



/iL Ft. Pierce AREC Research Report FTP-87-1 July 1987

Fosetyl-Al has no effect on bacterial wilt of tomato

R. M. Sonoda and Ann Brooks Gould* Central Science
Library'
ABSTRACT
OCT lit W87
Fosetyl-Al (Aliette), tri-basic copper sulfate, an tie
copper containing compound CGA183160, when app ied as
foliar sprays, alone and in combinations, failTal,"S r'tft8a
tomatoes from bacterial wilt (Pseudomonas sl--carum), at-
the concentrations tested, in a naturally infested field
soil. Combinations of fosetyl-Al with tribasic copper
sulfate or CGA 183160 reduced initial transplant growth.

------------------------------------------------------------------

Introduction

Bacterial wilt, caused by Pseudomonas solanacearum, is
an important systemic disease of tomatoes and other
solanaceous crops in tropical and subtropical climates
throughout the world (1). Bacteria enter openings in plant
roots, and, once in the xylem, spread throughout the plant.
Symptoms of systemic infection of older plants include
sudden wilting of part or all of the plant, vascular tissue
discoloration, the drooping and discoloration of leaves,
stunting, and eventual death of the plant. Young plants
infected with the bacterium die rapidly (2).
The systemic compound, fosetyl-Al (aluminum tris-0-
ethyl phosphonate), is effective in controlling several
diseases caused by Phytophthora species and other members
of the Peronosporales (3). Several researchers have
proposed that rather than directly affecting a pathogen,
fosetyl-Al may trigger a resistance response in the host
(3). Copper compounds are often effective against foliar
diseases caused by Pseudomonas sp. When fosetyl-Al and
various copper compounds are combined, there appears to be
an interaction resulting in greater phytotoxicity to citrus
leaves (Sonoda, unpublished).: The following study was
conducted to. determine if fosetyl-Al induced a protective
response in tomato to P. solanacearum and to determine if
there was any interaction of fosetyl-Al and copper
compounds on bacterial wilt incidence.

Materials and Methods

The compounds used in the test were: fosetyl-Al,
Aliette, Rhone-Poulenc, Inc; Tri-basic copper sulfate, TBCS
----------------------------------------------------------
**Professor and Post-doctoral Research Associate, University
of Florida, IFAS, Agricultural Research and Education
Center, Fort Pierce, Florida 34954.






53%, Tennessee Copper Corp.; and CGA 183160, Ciba-Geigy,
Inc. Eight week-old 'Better Boy' tomato plants in trays
were obtained from a nursery. Plants in trays were sprayed
with aqueous suspensions of the compounds alone or in
combination (Table 1) until runoff using a hand-held
sprayer. Distilled water spray was used as a check. The
plants were sprayed one day prior to transplanting and
again, 10 days after transplanting.
The tomato plants were transplanted into field soil
on the IFAS, AREC, Ft. Pierce grounds in April, 1987. The
site was selected because of its history of bacterial wilt.
The soil had been tilled, fertilized, bedded and covered
with polyethylene mulch a week before transplanting. Two
rows of tomato plants were set through the mulch into 2 in
diameter holes placed 1 ft apart. Four plants were
transplanted per treatment, and the treatments arranged
within a randomized complete block design. Each of the six
replicate blocks were positioned end-to-end.
Each tomato plant was individually watered with canal
water immediately after planting, and again four days
later. Plants were examined for symptoms of bacterial wilt
at three weeks and again at five weeks after planting. The
number of wilted plants per treatment were expressed as a
percentage of the total number of plants per treatment.
These percentages were transformed to arc sine before
subjection to an analysis of variance.

Results and Discussion

Three weeks after planting, tomato plants exhibiting
symptoms of bacterial wilt, from the presence of one
flagged leaf to wilted or stunted plants, were present in
each of the six treatments. By the fifth week, the
percentage of plants with wilt symptoms increased. None of
the compounds or combinations of compounds tested were
effective against bacterial wilt in spray suspensions at
the concentrations applied (Table 1). Further tests using
higher dosages of fosetyl-Al or other methods of treatment
such as root dip treatment prior to planting may be
warranted.
Shortly after planting several tomato transplants
died, presumably from fertilizer toxicity. Within the
first three weeks, plants treated with fosetyl-Al + tri-
basic copper sulfate, fosetyl-Al + CGA183160, and CGA183160
alone, were notably smaller than the control plants. By
the fifth week, however, about 3 weeks after the last spray
application, new growth on the plants sprayed with
combinations of fosetyl-Al and the copper compounds were
growing as well as new growth on control plants. These
observations indicate that there is an interaction between
fosetyl-Al and copper compounds. Further studies are
required to elucidate the mechanism of this phenomenon.






Conclusion

Fosetyl-Al did not induce a protective response against
P. solanacearum in the tomato plants used in this study.
Although there was an interaction of fosetyl-Al and the
copper compounds used in the study, the interaction did not
affect bacterial wilt development.


Table 1. Effect of fosetyl-Al and copper compounds sprayed
on 'Better Boy' tomato plants on incidence of bacterial
wilt at three and five weeks after transplanting.
-----------------------------------------------------------
Compound
concentration Bacterial Wilt
(ppm) (%)
------------------------ ---------------
first second three five
Treatment application application weeks weeks
-----------------------------------------------------------
Fosetyl-Al- 9600 4800 4.2a 26.4a

TBCS-- 7200 3600 8.3a 25.0a

CGA183160* 12000 6000 13.8a 25.0a

Fosetyl-Al 9600 4800
+ TBCS 7200 3600 4.2a 16.7a

Fosetyl-Al 9600 4800
+ CGA183160 12000 6000 6.7a 23.3a

Check** 8.3a 16.7a
-----------------------------------------------------------
Aliette (Rhone-Poulenc Phytosanitaire, France).
--Tri-basic copper sulfate, Tennessee Copper Corp., U.S.A.
*Ciba-Geigy, Inc.
**distilled water
"means in a column followed by the same letter are not
significantly different at p<0.05 (Duncan's multiple range
test).

Literature Cited

1. Sonoda, R. M. 1979. Bacterial wilt of tomato in
Florida: History, status, and sources of
resistance. Proc. Fla. State Hort. Soc.
92:100-102.
2. Agrios, G. N. 1978. Plant Pathology. Academic
Press, New York. p. 473-474.
3. Fenn, M. E., and M. D. Coffey. 1984. Studies on the
in vitro and in vivo antifungal activity of
fosetyl-Al and phosphorous acid. Phytopathology
74:606-611.




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