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Effect of Calcium applied Alone or with Ronilan Fungicide at two growth stages for control of white Mold on Canola Langdon, ND 2002. 

 

S. Halley, Langdon Research Extension Center-North Dakota State University, Box 310 Hwy 5 E Langdon, North Dakota 58249

*Corresponding author PH: (701) 256-2582, E-mail: shalley@ndsuext.nodak.edu   

 

Environmental conditions permitted development of only trace levels of white mold (Sclerotinia sclerotiorum).  No significant responses to yield, test weight, stand, plant height, and % oil, were found between fungicide treatments or application timing.

 

An experiment, randomized complete block design arranged as a 3 x 5 factorial with four replicates, was initiated at the Langdon Research Extension Center to determine effects of the calcium supplements, calcium sulfate or calcium chelate, applied alone or in combination with fungicide Ronilan (vinclozolin) for the control of white mold in canola at rosette, first flower, or rosette + first flower growth stage. Sclerotia harvested from sunflower and sclerotia prepared in vitro were broadcast, packed with a grain drill, and covered with soil prior to planting, 20 May. The cultivar �InVigor 2733� received rosette growth stage calcium applications on 24 June and/or first flower applications on 29 June. To improve the potential infection, ascospores were broadcast by CO2 backpack spray application 5 July at growth stage 30-40% bloom. The calcium chelate (12% calcium and 4% chelate) and calcium sulfate (29.2 % calcium and 17% sulfate) were commercial products supplied by NWC, Inc. The calcium chelate was applied at 3 qt/acre, calcium sulfate at 3.5 lb/acre, and Ronilan at 12 oz/acre. Supplement water was applied on several occasions through an overhead sprinkler system to increase potential for white mold infection. The CO2 backpack spray applications were applied at 40 psi in 18 gpa water with XR8002 nozzles.  Data was analyzed with the general linear model (GLM) in SAS. Least significant differences (LSD) were used to compare means at the 5% probability level.

 

June average temperature was 2 degrees above normal with precipitation at 6.37 inches, 3.2 inches above normal. The average July temperature was over two degrees above normal and precipitation nearly two inches below 30 year normal, 2.9 inches. The greatest rainfall event of the month was 0.36 inches on 5 July. July weather was not conducive to the development of disease.

 

  

Fungicide/

Timing

Yield

Test

Stand

Plant

Oil

Fertilizer

 

 

Weight

 

Height

 

 

 

lb/a

lb/bu

plants/ft2

inches

%

 

 

 

 

 

 

 

Calcium Chelate

Rosette

1417

52.3

7.4

29.5

43.0

 

First Flower

1546

51.9

8.3

29.0

42.7

 

Rosette + First Flower

1651

52.0

9.6

30.5

41.6

Calcium Sulfate

Rosette

1425

52.1

8.0

27.5

42.4

 

First Flower

1300

52.0

9.3

28.0

42.5

 

Rosette + First Flower

1415

51.9

8.0

31.0

41.9

Ronilan +

Rosette

1519

51.8

8.2

29.0

42.2

  Calcium Chelate

First Flower

1438

52.0

7.7

30.0

42.1

 

Rosette + First Flower

1538

52.1

7.9

31.0

42.2

Ronilan +

Rosette

1660

52.0

7.3

28.0

41.9

  Calcium Sulfate

First Flower

1527

52.3

7.9

32.0

41.8

 

Rosette + First Flower

1500

51.6

7.6

28.0

40.3

Ronilan

Rosette

1384

51.9

6.6

31.0

41.7

 

First Flower

1617

52.0

7.8

27.5

41.7

 

Rosette + First Flower

1524

52.4

9.7

28.5

42.8

 

 

 

 

 

 

 

Fungicide/fertilizer averaged over timings

 

 

 

 

 

 

 

 

 

 

 

 

Calcium Chelate

 

1535

52.1

8.4

29.7

42.4

Calcium Sulfate

 

1380

52.0

8.4

28.8

42.2

Ronilan +

 

1498

52.0

7.9

30.0

42.1

  Calcium Chelate

 

 

 

 

 

 

Ronilan +

 

1563

52.0

7.6

29.3

41.4

  Calcium Sulfate

 

 

 

 

 

 

Ronilan

 

1509

52.1

8.0

29.0

42.1

 

 

 

 

 

 

 

Timing average over fungicide/fertilizers

 

 

 

 

 

 

 

 

 

 

 

 

 

Rosette

1481

52.0

7.5

29.0

42.2

 

First Flower

1486

52.0

8.2

29.3

42.1

 

Rosette + First Flower

1526

52.0

8.6

29.8

41.8

 

 

 

 

 

 

 

Fung/Fert

 

NS

NS

NS

NS

NS

Timing

 

NS

NS

NS

NS

NS

Fun*Tim

 

NS

NS

NS

NS

NS

% C.V.

 

18

1

19

11

5

 

   
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