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.