Oakes Irrigation Research Site
Carrington Research Extension Center * North Dakota State University
P.O. Box 531, Oakes, ND 58474-0531, Voice: (701) 742-2189, FAX: (701) 742-2700, email: rgreenla@ndsuext.nodak.edu

 

CALCIUM USED ALONE AND IN COMBINATION WITH TOPSIN

TO REDUCE WHITE MOLD IN DRY BEAN, 2001

Pat Gross and Luis del Rio, NDSU Plant Pathology Department


See “WHITE MOLD CONTROL IN EDIBLE BEAN, 2001 STUDIES” for a description of materials and methods.


Discussion

Table 46. White mold incidence and severity, and dry bean yield


Table 45. Treatments in the calcium for white mold control in dry bean study at Oakes, ND, 2001.

Trt. No.

Chemical(s)

Rate per acre

Application times1

1

Untreated check

 

 

2

Calcium chloride

2 qt

bud, 10% bloom, and 100% bloom

3

Calcium chloride

3 qt

10% bloom and 100% bloom

4

Calcium chloride

3 qt

100% bloom and peak bloom

5

Calcium chloride

 + Topsin

3 qt

0.75 lb

10% bloom

100% bloom

6

Calcium chloride + Topsin

 + Topsin

3 qt + 0.75 lb

0.75 lb

100% bloom

peak bloom

7

Calcium chloride + Topsin

3 qt + 0.75 lb

10% bloom

8

Calcium chloride + Topsin

3 qt + 0.75 lb

100% bloom

9

Topsin

0.75 lb

100% bloom

10

Topsin

0.75 lb

10% bloom and 100% bloom

11

Topsin

1.5 lb

10% bloom and 100% bloom

1Bud - June 29; 10% bloom - July 2; 100% bloom - July 9; peak bloom - July 13.

  Row closure was at 20% on July 2 and at 80% on July 9.


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Table 46. White mold incidence and severity, and yield in the calcium for white mold control in dry bean study at Oakes, ND, 2001.

Treatment

number1

% incidence2

% severity3

Yield

(lbs/acre)

July 26

August 6

July 26

August 6

1

81.3

91.3

8.7

47.9

2543

2

82.5

100.0

10.9

60.5

2342

3

66.3

80.0

6.2

46.3

2208

4

68.8

82.5

8.4

38.4

2654

5

46.3

73.8

3.2

24.1

2833

6

50.0

75.0

4.7

23.0

2849

7

68.0

89.0

6.6

45.3

2322

8

51.3

68.8

3.9

23.2

2598

9

31.3

51.3

2.3

15.6

2815

10

35.0

63.8

2.5

22.8

2726

11

16.3

46.3

1.0

11.0

2833

LSD (0.05)

14.2

12.6

4.7

16.2

376

1See Table 45 for treatment descriptions.

2Incidence based on number of infected plants divided by total number of observations.

3Severity is based on average percentage disease of four replications.


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Discussion

Rainfall was below average for the growing season. Frequent irrigation throughout the summer provided good soil moisture for plant development. Temperatures were warmer then the five-year average starting around June 8. These warm temperatures provided favorable plant growth. Plants began to flower around July 1. Plants continued to flower uniformly for most of the summer. White mold was not observed from natural infection so a suspension of white mold spores was sprayed on the middle two rows of each plot on July 9 to insure white mold infection. White mold was observed in the field around seven days later. White mold was uniform across the field.


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Go to Oakes Irrigation Research Site 2001 annual report

Go to Oakes Irrigation Research Site disease studies

Go to Oakes Irrigation Research Site crop index

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