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Title: Celery fungicide experiments.
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Permanent Link: http://ufdc.ufl.edu/UF00076893/00002
 Material Information
Title: Celery fungicide experiments.
Series Title: Celery fungicide experiments.
Physical Description: Serial
Language: English
Creator: Berger, R. D.
Publisher: Agricultural Research and Education Center.
Place of Publication: Belle Glade, Fla.
Publication Date: 1975
 Record Information
Bibliographic ID: UF00076893
Volume ID: VID00002
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 166140846

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Belle Glade AREC Research Report EV-1975-19 December 1975 ---

Celery Fungicide Experiment Fal and Winter 1975
R. D. Berger-

Early blight, incited by Cercospora apii, is the most important foliar fungal
disease of Florida celery. Bacterial blight, incited by Pseudomonas cichorii, is
Florida celery's most important bacterial disease. The latter disease is. occsion-;
ally severe during warm rainy seasons, particularly in-August-October. The-evaluation
of standard and experimental compounds for control of these two diseases is part of
the ongoing Plant Pathology program at AREC-Belle Glade.

Materials and Methods

Plants of celery variety 'EES 2-14' were set on August 29, 1975 in Field F2SE
at the AREC-Belle Glade. Individual treatment plots were 25 feet long with four
replications. Rows were oriented in an East-West direction. Spray applications were
made once each week with a motorized plot sprayer operating at the equivalent of
100 gal/A. Toxaphene insecticide was added to each spray mixture.

Results and Discussion

The 1975 Fall season was characterized.by frequent heavy rains which commonly
subjected the experimental area to flooding. Plant growth was subsequently slow,'
intermittent, and non-uniform. The frequent rains allowed severe bacterial blight
to develop naturally in the early season followed by advancing early blight. Cold
weather in late November slowed both diseases considerably.

The estimated percent celery foliage affected with early blight for eight
rating dates along with the various treatments are given in Table 1.

Largely because of plot orientation with respect to the prevailing wind and
localized flooding, initial disease spread was non-uniform and focalized making
estimates difficult and variable among replicates.

The organic fungicides alone or in combination with copper materials provided
the best early blight control. Kocide alone also provided good control. The two
liquid coppers were generally slightly inferior to Kocide in control of early blight.

No significant difference in control of bacterial blight by the various treat-
ments was observed. All provided inadequate control. This was disappointing, for
the copper materials are the standard recommended control for this disease. In
previous tests, copper materials provided significant control, but these were then
applied on a more frequent schedule.

The Rhizoctonia disease occurred in very low incidence and no control data
could be obtained.







/ Associate Plant Pathologist, University of Florida, Agricultural Research and
Education Center, Belle Glade, Florida 33430.











Table 1. Percent celery (2-14) foliage affected with early blight (Cercospora apii)
in fungicide spray experiment, 1975.



S% Disease-b
Treatment-a Oct 2 Oct 8 Oct 15 Nov 6 Nov 12 Nov 21 Dec 2 Dec 10

1. Check 4.4 8.2 18.2 12.5 28.9 28.9 34.0 35.7
2. Oxycop 2.9 7.6 12.5 7.2 15.8 18.0 16.4 15.6
3. M-200+Oxycop 3.5. 9.4 9.7 7.8 12.9 16.0 13.7 11.7
4. Bravo+Oxycop 3.5 8.2 12.3 6.7 18.4 19.2 13.7 16.8
5. Copper Count N 3.2 16.4 19.9 8.2 15.8 16.4 19.9 23.5
6. M-200+CCN 1.0 3.5 8.2 4.5 5.8 8.4 9.2 11.8
.7. Bravo+CCN 3.2 9.1 12.6 6.7 10.4 10.6 8.8 10.2
8. Kocide 1.2 4.1 3.8 3.7 7.6 7.0 11.4 8.4
9. H-200+Kocide 2.4 4.4 7.7 3.8 8.4 8.6 8.2 12.1
10. Bravo+Kocide 1.4 6.4 11.8 4.8 11.1 8.2 5.9 7.2
11. MIanzate 200 1.6 5.3 11.2 6.7 7.6 7.2 8.0 7.6
12. Bravo .9 2.6 4.5 4.3 .; 5.8 7.6 7.6 5.3


RATES/100 gal were:
200-1.5 Ib, and BRAVC
27, November 3, 10, ]


OXYCOP-2 qt, Copper C
)-1 pt. Spray dates w
17, 24 and December 1.


ount N-2 .qt, KOCIDE-2
ere September 22, 29,


lb, Manzate
October 6, 13,


Disease estimates made using the Horsfall-Barratt rating scale. Estimates
transformed to percent disease using ELANCO Tables. Figures are averages of four
replications.


EV-1975-19 250 copies




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