Table 15. 2021 MG-4E Roundup Ready Disease Tests

Table 15. Yields and disease ratings of 12 Maturity Group IV Early (4.0-4.5) Glyphosate / Dicamba tolerant soybean varieties in nine 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
	Local Seed 4299XS	65.9	61.6	53.6	LOW	HIGH	LOW	66.9	63.4	LOW	LOW	MOD
A	Local Seed 4565XS	64.1	63.8	54.1	NONE	LOW	LOW	68.5	66.4	NONE	LOW	MOD		S
A	NK 42-T5XF	63.7	59.4	54.1	LOW	MOD	LOW	66.7	62.9	LOW	LOW	MOD		R
AB	NK 44-J4XFS	62.5	64.9	56.8	LOW	LOW	LOW	64.4	64.6	LOW	LOW	MOD
AB	Dyna-Gro S43XS70	61.7	59.2	52.8	LOW	MOD	LOW	64.2	62.4	LOW	LOW	MOD		R
AB	Armor 45D-20	61.3	60.4	52.0	LOW	NONE	LOW	71.0	65.9	LOW	LOW	MOD	SDS	R
AB	Progeny 4505 RXS	60.8	58.0	56.0	NONE	NONE	LOW	71.0	66.9	LOW	NONE	MOD		MS
AB	Asgrow 45XF0	60.7	57.1	48.9	NONE	NONE	LOW	63.2	60.3	NONE	NONE	MOD		R
AB	USG 7441XF	59.9	53.2	45.5	LOW	NONE	LOW	64.0	61.3	LOW	LOW	MOD		R
B	Dyna-Gro S41XS98	59.0	59.2	50.6	MOD	NONE	LOW	71.1	66.7	LOW	LOW	MOD		R
B	Armor 42D-27	58.8	58.2	53.4	MOD	LOW	LOW	69.1	64.0	LOW	NONE	MOD		R
B	Beck’s 4119X2	58.4	56.3	48.0	HIGH	NONE	LOW	67.4	62.3	LOW	LOW	MOD		MR
	Average	61.4	59.3	52.2				67.3	63.9

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 Aug. 3, and harvested Oct. 19

RECM varieties planted May 25, sprayed Aug. 2, and harvested Nov. 4

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 – 15%, averaged 4%; Target spot from 0 – 16%, averaged 3%; Brown spot from 5 – 13%, averaged 9%

Disease ratings at RECM: Frogeye leaf spot ranged from 0 – 8%, averaged 3%; Target spot from 0 – 8%, averaged 3%; Brown spot from 12 – 27%, averaged 18%

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