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Oat Cultivar Selection and Fungicide Application for Control of Rust, 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  

 

The principle disease of oats in the region is Puccinia coronata Corda (Crown Rust). The disease can be devastating to yield and create severe lodging problems making harvest difficult. Most of the effort to manage the disease has been through development of resistant cultivars. However, fungicides could be a management tool when economics are favorable for application. Cultivars selected for study included AC Assiniboia and Morton (resistant to crown rust), Killdeer (moderately resistant to crown rust) and Otana (susceptible to crown rust). Fungicides selected for study include Headline (pyraclostrobin) from BASF and Stratego from Bayer (propiconazole + trifloxystrobin). Neither compound is currently registered for application to oats.  A randomized complete block design arranged as a cultivar x fungicide factorial was selected for analysis of mean comparisons. Two planting dates, 4 May and 30 May, were selected for evaluation. Plant date data was analyzed as separate trials. 

 

Crown rust developed late in the season essentially having minimal effect on the early planting. A fungicide*cultivar interaction was measured for rust 30 July evaluation date on both plant dates. Rust levels were reduced for Killdeer and Otana. Yield was increased by Stratego application to AC Assiniboia at late plant. Both Headline and Stratego reduced yield on Morton late plant. A repeat of the study is planned for 2003.

 

 

Cultivar

Fungicide

Plant

Lodging

Yield

Test

Protein

Rust

Rust

 

 

Date

 

 

Weight

 

 

 

 

 

 

 

 

 

 

5 Jul

30 Jul

 

 

 

%

bu/ac

lb/bu

%

%

%

 

 

 

 

 

 

 

 

 

AC Assiniboia

Check

Early

29.8

131.5

36.4

15.1

0.8

0.0

 

Late

24.0

  58.3

32.1

14.9

1.3

0.5

 

Headline

Early

  6.9

111.9

36.1

15.1

0.0

0.0

 

 

Late

  8.0

  67.5

32.8

14.1

0.7

0.3

 

Stratego

Early

21.8

127.6

36.0

15.2

0.0

0.2

 

 

Late

44.7

  75.6

32.5

14.0

0.3

0.0

 

 

 

 

 

 

 

 

 

Killdeer

Check

Early

30.4

128.5

35.8

13.6

1.3

2.2

 

 

Late

21.0

  70.9

31.5

14.1

1.3

0.3

 

Headline

Early

68.5

139.8

36.0

13.7

0.3

0.2

 

 

Late

47.0

  82.5

32.8

13.3

1.0

0.0

 

Stratego

Early

28.9

122.1

36.3

13.6

0.0

0.0

 

 

Late

44.5

  74.1

30.3

14.4

0.0

0.0

 

 

 

 

 

 

 

 

 

Morton

Check

Early

  1.1

110.3

38.6

14.9

0.5

0.5

 

 

Late

15.0

  70.5

34.0

15.1

0.3

1.0

 

Headline

Early

11.9

113.6

37.9

14.4

1.0

0.0

 

 

Late

  1.5

  49.0

33.0

15.1

1.0

0.0

 

Stratego

Early

  8.3

111.6

37.9

15.0

0.3

0.2

 

 

Late

  9.0

  57.1

32.2

14.4

1.3

0.0

 

 

 

 

 

 

 

 

 

Otana

Check

Early

58.5

105.3

35.4

13.7

2.3

31.3

 

 

Late

44.5

  42.1

28.3

12.6

3.0

3.6

 

Headline

Early

41.5

121.3

36.5

13.8

2.5

4.5

 

 

Late

63.3

  54.6

32.8

13.7

2.0

0.0

 

Stratego

Early

21.0

131.7

37.4

13.6

2.3

0.2

 

 

Late

29.8

  51.1

32.5

13.9

0.7

0.0

 

 

 

 

 

 

 

 

 

Cultivar1

 

Early

NS

NS

0.8*

0.5

0.7

NS

Fungicide1

 

 

NS

NS

NS

NS

NS

NS

Cult*Fung1

 

 

NS

NS

NS

NS

NS

11.4

% C.V.

 

 

80

13

3

6

76

238

 

 

 

 

 

 

 

 

 

Cultivar1

 

Late

NS

7.5*

NS

NS

NS

NS

Fungicide1

 

 

NS

NS

NS

NS

NS

NS

Cult*Fung1

 

 

NS

13.1*

NS

0.9*

NS

1.3*

% C.V.

 

 

96

15

7

5

75

189

1NS=not significant, *, ** Significant at 0.05, 0.01 probability level for mean comparisons.

 

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