Title: Celery - early blight fungicide experiments.
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 Material Information
Title: Celery - early blight fungicide experiments.
Series Title: Celery - early blight 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: 1973
 Record Information
Bibliographic ID: UF00076895
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 166140849

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*\ Belle Glade AREC Research Report. EV-1974-4 HUME U fAW Yl 9 4

Celery Early Blight Fungicide Ex eriment. Spring 1973
"" l m "19 74
R. D. Berger

A portion of the continuing plant pathology j'.reerciJ ga i f6g Eit lh ,evaluation
of fungicides for celery disease control. The result of LTh SpTilg '1l .73 celery
fungicide experiment conducted at the Agricultural Research and Education Center,
Belle Glade are presented in this report.

Materials and Methods
Plants of celery variety 'Florida 2-14' were set on 16 March 1973 and main-
tained with common horticultural methods. Sources and rates of materials are given
in the accompanying table. Spray applications were made once each week with a motor-
ized plot sprayer operating at the equivalent of 100 gal/A Insecticides (Dibrom or
Diazinon) were generally added to each spray mixture. Individual treatment plots
were 25 feet long; there were four replications. Ratings were made using the Hors-
fall-Barratt rating scale and converted with ELANCO Tables.

.Results and Discussion
Early blight (Cercospora apii Fres.) developed slowly during April and the
first disease ratings were made on 17 May 1973. Even at this early stage in the
epidemic, superior disease control with several treatments were noticed, and they
maintained their relative ranking through the season.

There was little difference observed between the various copper treatments
early in the experiment but slightly better control with Kocide was found by the
final rating (8 June). Blight control by Citcop 4E faltered slightly toward the
season's end (4 and 8 June). There was some increase in control with increase in
rate of tribasic copper sulfate (treatments..2-5) as noted particularly on 4 June.
None of the copper fungicides alone provided commercial blight control when used in
a weekly program.

The' addition of copper compounds 'to either Bravo or Manzate significantly im-
proved blight control over that obtained by .either material.when used alone.

Cercospora apii resistance to benomyl (Benlate) and related compounds was
noticed from the start of the experiment. Disease progressed in these treatments
at about the same rate as in the unsprayed control. The addition of Benlate to
Ianzate did not significantly improve control over that obtained by Manzate alone.
This was likely a result of the early and nearly complete dominance of the benomyl
resistant strain in the plots.






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












Table 1. Results of Spring, 1973 Celery Spray Experiment, AREC, Belle Glade.a/


Rate
(lbs/100 gal)


% Cercospora


5-17 5-24 5-31


Old
New
New
New
New
New


TBCs
Imp TBCS
Imp TBCS
Imp TBCS
Imp TBCS
50% TBCS


1
2
3
4
5
S 6
6
7
8
9
10
11
12
13
14
15
16
17
18
19


4
1
2
3
4
2
2
2qt
1.5+2
1.5+2qt
1.5+2
1.5
1.5
0.25
1.5+0.25
0.25
0.25
8fl. oz.


Unsprayed


5.0
7.6
7.0
7.4
5.6
5.5
3.5
5.8
1.8
2.0
2.6
2.7
3.1
8.8
3.3
9.4.
10.5.
12.9
16.4


13.7
24.2
18.8
12.5
15.2
17.6
14.8
17.2
5.0
3.4
5.3
4.2
7.6
38.0
7.6
31.0
43.8
35.9
42.7


22.3
31.6
28.1
25.0
23.4
32.8
23.4
41.4
5.7
4.7
6.4
5.7
11.5
63.5
11.7
53.6
60.7
59.4
50.0


42.2
52.1
51.6
54.2
52.9
50.5
37.0
55.7
9.8
8.2
27.3
19.5
48.4
84.4
42.7
82.8
85.9
84.4
84.6


a/ Spray dates: April 2, 9, 18, 23, 30; May 7, 14, 21, 29.


TBCS = Cities Service tribasic copper sulfate; New Imp = New Improved.tribasic
copper sulfate; M-200 = Manzate (DuPont) M-200; R & H 3928 = Rohm & Haas Co.;
Kocide = cupric hydroxide (Kennecott Corp.); Bravo (Diamond Shamrock);.Topsin
(Pennwalt Corp.); Mertect (Merck & Co.).


EV-1974-4 300 copies


Blight
6-4


6-8


Kocide
Citcop 4E
Bravo + New Imp
Bravo + Citcop 4E
M-200 + New Imp
Bravo
M-200
Benlate
M-200 + Benlate
R & H 3928
Topsin
Mertect


---


a b/
Material--


0.8
1.8
1.6
1.8
1.3
2.0
1.2
2.9
0.6
0.8
0.8
0.7
1.1
2.9
1.2
2.9
2.9
2.9
3.2




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