Table 9. 2021 MG-3 Roundup Ready Disease Tests

Table 9. Yields and disease ratings of seven Maturity Group III Roundup Ready Xtend soybean varieties in three County Standard Tests and in small plot trials at two locations in Tennessee during 2021.

Summary from County Tests			Summary from Small Plot Research
		Avg.	On-farm Location in Jackson (JAX)					Research & Education Center at Milan (RECM)						Soybean
		Yield	Yield (bu/ac)		Frogeye	Target	Brown	Yield (bu/ac)		Frogeye	Target	Brown	Other	Cyst
MS	Variety	(bu/ac)	*Treated	Non-treated	leaf spot	spot	spot	*Treated	Non-treated	leaf spot	spot	spot	Diseases	Nematode
A	AgriGold G3722RF***	58.1	49.2	47.7	NONE	HIGH	LOW	57.3	53.1	NONE	MOD	MOD		MR
AB	Asgrow 38XF1	57.6	44.7	44.9	NONE	MOD	LOW	57.9	51.5	NONE	HIGH	MOD		R
AB	NK 39-A1XF	56.0	44.6	37.5	HIGH	HIGH	LOW	51.8	45.5	MOD	HIGH	LOW		R
AB	Asgrow 36XF1	55.5	46.3	43.1	MOD	MOD	LOW	56.9	50.3	LOW	MOD	MOD		R
ABC	Local Seed LS3908XFS	54.2	51.9	50.1	LOW	NONE	LOW	56.4	55.1	NONE	LOW	HIGH		R
BC	Asgrow 37XF1	50.1	41.0	37.3	LOW	HIGH	LOW	53.1	49.1	LOW	MOD	LOW		R
C	AgriGold G3630XF	47.5	38.9	33.6	MOD	LOW	LOW	55.8	50.5	MOD	NONE	HIGH	SDS	R
	Average	54.1	45.2	42.0				55.6	50.7

Yield adjusted to 13% moisture

MS= Varieties that have any MS letter in common are not statistically different in yield (based on 95% confidence)

*Treated plots sprayed with Miravis Top @13.7 fl oz/a + 0.25% Induce @ R3 growth stage

JAX varieties planted May 24, sprayed July 27, and harvested Oct. 19

RECM varieties planted May 25, sprayed July 26, and harvested Oct. 11

NONE, LOW, MOD, and HIGH is a relative ranking of disease severity at each location. Other diseases noted: SDS = Sudden Death Syndrome

Soybean Cyst Nematode rateds as Resistant (R), Moderately Resistant (MR), Moderately Susceptible (MS), Susceptible (S), or High Susceptible (HS) to HG Type 1.2.5.7/Race 2

Disease ratings at JAX: Frogeye leaf spot ranged from 0 – 13%, averaged 3%; Target spot from 0 – 14%, averaged 7%; Brown spot from 10 – 17%, averaged 13%

Disease ratings at RECM: Frogeye leaf spot ranged from 0 – 9%, averaged 2%; Target spot from 0 – 19%, averaged 10%; Brown spot from 7 – 21%, averaged 13%

Disease ratings & yield data compiled by Dr. Heather Kelly, Rachel Guyer, and Wesley Crowder from replicated plots at 2 locations

County data provided by Ryan Blair, Ext. Area Specialist, and County Extension agents

Soybean Cyst Nematode data provided by Dr. Lesley Schumacher, USDA Research Plant Pathologist