Soybean Fungicide Test Report 2003 - Soybean Diseases in Arkansas

Soybean ('variety') was drill-seeded in 9- row (7 in. spacing) x 25- ft- long plots on 26 Apr (Early) and 30 May (late) at the University of Arkansas Pine Tree Experiment Station in a Calloway Silt Loam soil. Seed was treated using a Gustafson Lab Treater with a spray volume of 20 fl oz/cwt and seed counted to provide 3 seed per row ft planted. The early plot area received 0-40-40 and the late plot area received 0-40-60 fertilizer on 30 Mar. Early plots received 2 pt/A Prowl + 2.8 oz/A Sceptor on 11 Apr, 1.5 pt/A Storm on 10 May, 8 oz/A Select on 23 May and 3 pt/A Typhoon on 14 Jun for weed control. The later planted plots received 2 pt/A Prowl + 2.8 oz/A Sceptor on 20 May and 3 pt/A Typhoon on 14 Jun for weed control. Early planted plots were irrigated with overhead sprinklers on 7 Jul, 15 Jul and 1 Aug while the later planted test was irrigated 10 Jul, 17 Jul, 1 Aug and 27 Aug with an overhead sprinkler. Stand counts were taken 26 May on the early test and 29 Jun on the later planted test. Plots were harvested using a Hege plot combine and yield was adjusted to 13.5 % grain moisture. Data were analyzed by analysis of variance using ARM software with means separation by the LSD test (Gylling Corporation).

Seed treatments did not result in a significant increase in stand or yield in the early planted test although a trend for higher and more uniform stand was noted for all the treatments compared to the untreated plots. Seed treatments did not result in a stand increase in the later planted test either but there was a significant yield increase for the Vitavax 200 + Allegiance and the YieldShield treatments at P=0.10. Yield also trended higher for the Soygard and Apron XL + Maxim plots. Weather conditions were optimal for soybean growth and develop during the summer months. None of the treatments showed phytotoxicity.

Treatment No.	Treatment			Early Planted Test		Later Planted Test
Treatment No.	Treatment			Stand (plants per 10 row ft)	Yield (Bu/A 13.5%)	Stand (plants per 10 row ft)	Yield (Bu/A 13.5 %)
1	Untreated			15	32	16	61
2	Vitavax 200	3	fl oz/ cwt	18	34	15	72
2	Allegiance	0.36	fl oz/ cwt
3	L1269	5.7	fl oz/ cwt	18	33	16	62
4	Soygard	0.32	fl oz/ cwt	18	37	16	68
5	Apron XL	0.24	fl oz/ cwt	17	37	16	67
5	Maxim	0.08	fl oz/ cwt
6	Yield Shield	0.2	fl oz/ cwt	18	32	17	71
LSD (P=.05)				NS	NS	NS	9.1
CV				10.15	15.83	12.25	9.07
Treatment F				1.684	0.634	0.416	2.277
Treatment Prob(F)				0.199	0.6773	0.8302	0.0996

Acknowledgments: We thank Mr. Roger Eason, Director of the Pine Tree Experiment Station and his staff for making these trials possible. We also appreciate the support of Mr. Chip Graham, Gustafson LLC.

					Early Planted Test		Later Planted Test
Treatment No.	Treatment	Rate		Plot	Stand (plants per 10 row ft)	Yield (Bu/A 13.5%)	Stand (plants per 10 row ft)	Yield (Bu/A 13.5%)
1	Untreated			101	15	33	10	59
				202	14	35	16	64
				303	16	37	18	64
				404	16	24	18	57

mean =					15	32	16	61

2	Vitavax 200	3	Fl oz/ cwt	102	16	33	15	67
2	Allegiance	0.36	Fl oz/ cwt	205	16	31	15	71
				306	18	29	15	86
				401	22	43	16	64

mean =					18	34	15	72

3	L1269	5.7	Fl oz/ cwt	103	18	39	13	70
				206	20	32	18	57
				305	17	33	16	65
				403	16	29	18	56

mean =					18	33	16	62

4	Soygard	0.32	Fl oz/ cwt	104	18	42	12	64
				201	17	43	16	68
				302	18	35	18	68
				405	20	26	17	74
mean =					18	37	16	68
5	Apron XL	0.24	Fl oz/ cwt	105	15	40	15	69
5	Maxim	0.08	Fl oz/ cwt	204	18	37	18	63
				301	17	41	18	73
				402	16	30	14	63
mean =					17	37	16	67
6	Yield Shield	0.2	Fl oz/ cwt	106	16	35	18	72
				203	16	39	16	65
				304	20	32	17	69
				406	18	22	17	78
mean =					18	32	17	71

By: Joe Shafer, Mark Trent, Rick Cartwright, Charlie Parsons and Caroline Carpenter

Pictures of chickens, flowers, wheat, a boy looking through a magnifying glass, irrigation pipe, soybean pods, and fruits and vegetables.	Cooperative Extension Service





Cooperative Extension Service	Agricultural Experiment Station
Search \| Publications \| Jobs \| Personnel Directory \| Links County Offices \| Departments

Plant Diseases Soybean Diseases in Arkansas Soybean Fungicide Test Report 2003

Plant Diseases
Soybean Diseases in Arkansas
Soybean Fungicide Test Report 2003