Oat Cultivar Selection and Fungicide Application for Control of Rust

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
AC Assiniboia		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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