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Title: Celery fungicide experiments.
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Permanent Link: http://ufdc.ufl.edu/UF00076893/00001
 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: 1974
 Record Information
Bibliographic ID: UF00076893
Volume ID: VID00001
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-1974-19


S... ,Celety fungicide experiments Spring 1974

R. D. Berger-
R, igit s
SEarl lignt, ca used by Cercospora apii Fres., remains the most important
foliar disease of celery. 1The evaluation of fungicides to control this disease is
part.of, the tonhiii~E iig t Pathology research program. The results of two ex-
periments conducted in Spring 1974 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 26 February 1974 and 11-13
Marcn 1974 for tests I and II, respectively. Individual treatments were single row
plots, 25 ft. long, with four replications. Sources of materials are given in Table
1. Spray applications were generally made once each week with a motorized plot
sprayer operating at the equivalent of 100 gal/A. Insecticides (Dibrom, Diazinon,
or toxaphene) were generally added to each spray mixture.

Results and Discussion
The weather during March and April 1974 was unseasonably dry, consequently
early blight developed slowly. Rainy periods in May stimulated substantial blight
spread in the plots and the disease reached epidemic proportions in late May. Plot
orientation was with the rows running East-West (prevailing wind from the East) and
this likely accounted for the very uneven disease development among replicates.
There was also strong evidence of a "position effect" (extraordinary blight spread
in specific rows across replicates indicating a physical or mechanical source con-
tributed to infection). One likely source of this effect may have been the herbi-
cide applicator.
The disease ratings for the two tests are given in Tables 2 and 3. In test I
(Table 2), the combination of Kocide and Manzate 200 was superior to Manzate 200
alone (27 May). The addition of the sticker-extender, Nu-Film 17, to several fung-
icides and combinations proved to be of some benefit in giving better disease
control. A greater response to this chemical addition possibly could have occurred
under a more frequent spray schedule because most infections take place as tissue
emerges from the heart area. The once-a-week schedule mainly affected control on
the already exposed leaves. The combination of "half" rates of Bravo and Dithane
M-45 (Treatment 18) provided good control of blight and this combination has the
added benefit of slightly lower cost over a full rate program of Bravo.


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


June 1974









In test II, most of the treatments involved evaluation of rates and experi-
mental formulations. Resistance of C. apii to benomyl (Benlate) again showed up
in the test. The addition of Manzate 200 to Benlate slowed the buildup of
resistant C. apii. However, this program did not provide satisfactory blight control
under the conditions of this test where the treatment was subjected to large in-
fluxes of resistant spores.


Table 1. Sources of fungicide and materials used in celery experiments in Spring,
1974.


Material


Source


Dyrene 50W
Nu-Film-17 (Pinolene)
Manzate 200 80W (M-200)
Kocide (54% Cu) cupricc hydroxide)
Tribasic copper sulfate (56% Cu) (TBCS)
Techmangan (Tech Mn)
Bravo 6F
Benlate 50W
Dithane M-45


Chemagro Corp.
Miller Chemical Co.
DuPont Chemical Co.
Kocide Corp.
Cities Service Co.
Eastman Chemical Co.
Diamond Shamrock Chemical Co.
DuPont Chemical Co.
Rohm & Haas Co.


EV-1974-19 350 copies










Table 2. Percent Cercospora blight in celery in Spring, 1974 Experiment I.a



Rate % Blightb/
Material lb/100 gal/A 6 May 15 May 27 May 31 May

1. Unsprayed Check -- 5.9 e 8.6 d 49.0 d 84.7 d

2. Dyrene 1.5 2.3 bc 5.8 c 42.7 cd 56.3 bc

3. Dyrene + Nu-Film 1.5+1 pt. 1.8 ab 5.4 bc 39.0 c 52.1 ab

4. M-200 1.5 1.6 ab 4.2 ab 38.3 c 56.3 bc

5. M-200 + Nu-Film 1.5+1 pt. 1.6 ab 3.9 ab 37.0 c 50.0 ab

6. M-200 + Kocide 1.5+2 1.7 ab 3.9 ab 24.2 ab 47.9 a

7. M-200 + Kocide
+ Nu-Film 1.5+2+1 pt. 1.4 a 3.0 a 21.1 a 50.0 ab

8. Kocide 2 1.3 a 3.5 a 30.4 abc 58.4 bc

9. Kocide (Exp. 74-
178) 2 1.6 ab 4.8 b 33.6 bc 64.8 c

10. TBCS 4 2.3 bc 4.2 ab 27.3 ab 63.0 c

11. TBCS (New Exp.) 4 2.3 bc 5.6 bc 32.8 bc 58.3 bc

12. Tech Mn 1.5 3.8 d 9.0 d 58.4 e 88.2 d

13. Bravo + Tech Mn 1 pt.+1.5 1.5 ab 3.7 a 34.9 bc 58.4 bc

14. Bravo + M-45 .5 pt.+.75 1.0 a 2.9 a 25.8 ab 54.2 ab


a Bay MEB 6449 and 6447 also included in this test but sample supply was exhausted
before 1 May. Spray dates were: 22 and 25 March; 2, 8, 15, 22 and 29 April;
6, 13 and 22 May.

bAvg of 4 replicates; based on Horsfall-Barratt rating scale converted with Elanco
tables. Means followed by same letter are not significant at 5% level (Duncan's
Multiple Range Test).










Table 3. Percent Cercospora blight in celery in Spring, 1974 Experiment II.



Rate % Blight-a
Material #/100 gal/A 27 May -31 May 4 June 10 June 14 June


1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.


Bravo

Bravo

Bravo

Bravo 3WM

Bravo 3 WM

Bravo 3WM

Bravo 9WM

Bravo 9WM

Bravo 9WM

Bravo 13WM

Bravo 13WM

Bravo 131WM

Benlate

Benlate + M-200

DPX-10

DPX-10

DPX-112

DPX-112

Kocide 404S

Kocide 74-186


0.5 pt

1.0 pt

1.5 pt

0.5 pt

1.0 pt

1.5 pt

0.5 pt

1.0 pt

1.5 pt

0.5 pt

1.0 pt

1.5 pt

0.5 lb

0.25+1.5 lb

0.5 lb

2.0 lb

1.5 lb

2.0 lb

2 qt

2 qt


4.1

3.5

2.9

3.5

2.9

2.0

4.7

3.5

2.3

2.9

2.3

2.3

8.2

4.7

6.4

4.7

3.5

3.5

3.5

4.1


5.9

4.7

4.1

8.2

5.8

3.5

21.1

10.6

4.7

7.6

4.1

3.5

28.4

24.7

28.5

25.4

18.8

13.5

15.2

20.5


12.9 ab

12.3 ab

7.3 a

22.7 ab

10.6 a

8.2 a

29.4 b

19.9 ab

10.6 a

20.4 ab

8.2 a

5.9 a

37.6 b

31.8 b

26.5 b

24.7 b

18.4 ab

'13.8 ab

14.1 ab

13.8 ab


15.2

11.7

9.2

25.8

24.7

16.2

34.9

37.6

18.0

20.7

18.2

9.4

54.7

36.0

47.4

40.4

18.8

15.6

15.6

18.8


a

a

a

ab

ab

a

bc

bc

ab

ab

ab

a

cd

bc



c

ab

a

a

ab


17.6

10.6

9.2

33.6

37.9

27.2

49.8

58.6

16.4

28.9

20.3

14.1

69.2

50.9

65.4

63.3

49.2

41.4

27.4

32.0


a/
SAvg of 4 replicates; based on Horsfall-Barratt rating scale converted with Elanco
tables. Means followed by same letter are not significantly different at 5% level
(Duncan's Multiple Range Test). Spray dates were: 2, 8, 15, 22 and 29 April; 6,
13, 21, 27, and 31 May.


a

a

a

bc

bc

bc

cd

d

a

bc

ab

a

e

cd

e

e

cd

bc

ab

ab


1


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