Table 22. 2020 MG-4L Roundup Ready Disease Tests

Table 22. Yields and disease ratings of 27 Maturity Group IV Late (4.6-4.9) Roundup Ready soybean varieties in 10 County Standard Tests and in small plot trials at one Research and Education Center and two on-farm locations in Tennessee during 2020

Summary from County Tests			Summary from Small Plot Research
		Avg.	Research & Education Center at Milan (RECM)				On-farm Location in Jackson (JAX1)					On-farm Location-Behind Wheat (JAX2)
		Yield	RECM – YLD		Frogeye	Target	JAX1 – YLD		Frogeye	Target	SDS	JAX2 – YLD		Frogeye	Soybean rust
MS	Variety	(bu/ac)	*Treated	Non-treated	leaf spot	Spot	*Treated	Non-treated	leaf spot	Spot		*Treated	Non-treated	leaf spot
A	Asgrow 49X9	66.7	51.7	50.8	LOW	LOW	51.7	50.8	LOW	LOW		35.8	31.6	LOW	MOD
A	Asgrow 46X0	66.3	51.8	50.0	LOW	LOW	51.8	50.0	LOW	LOW		31.3	30.1	LOW	MOD
A	Local Seed 4806XS	66.1	52.5	45.7	LOW	LOW	52.5	45.7	LOW	LOW	LOW	45.4	39.9	LOW	MOD
AB	Local Seed 4999RX	65.0	52.2	49.7	LOW	LOW	52.2	49.7	LOW	LOW	LOW	39.8	33.5	LOW	MOD
ABC	AgriGold G4820RX	63.8	49.2	47.0	LOW	LOW	49.2	47.0	LOW	LOW		33.4	29.6	LOW	MOD
ABC	USG 7489XT	63.8	36.3	33.3	LOW	LOW	36.3	33.3	LOW	LOW		32.4	30.8	LOW	MOD
ABCD	Dyna-Gro S48XS90	63.5	53.4	52.8	LOW	LOW	53.4	52.8	LOW	LOW	HIGH	31.3	28.2	LOW	MOD
ABCDE	GoSoy GS47X19	63.1	50.4	42.1	LOW	LOW	50.4	42.1	LOW	LOW	HIGH	38.5	35.6	LOW	MOD
ABCDE	Dyna-Gro S48XS56	62.9	48.5	46.2	LOW	LOW	48.5	46.2	LOW	LOW	LOW	33.3	29.4	LOW	MOD
ABCDE	LG Seeds 4899RX	62.9	47.7	46.5	MOD	LOW	47.7	46.5	MOD	LOW		33.3	28.4	MOD	MOD
ABCDE	USG 7480XT	62.7	51.2	49.7	LOW	LOW	51.2	49.7	LOW	LOW	HIGH	40.5	32.9	LOW	MOD
ABCDE	NK S47-Y9X	62.6	51.5	48.9	LOW	LOW	51.5	48.9	LOW	LOW	LOW	27.4	24.6	LOW	MOD
ABCDE	Asgrow 48X9	62.5	56.1	49.5	MOD	LOW	56.1	49.5	MOD	LOW	LOW	27.5	23.6	LOW	MOD
ABCDE	NK S49-F5X	62.4	56.6	53.6	LOW	LOW	56.6	53.6	LOW	LOW	LOW	38.7	31.6	MOD	MOD
ABCDE	Asgrow 46X6	62.0	45.3	44.4	LOW	LOW	45.3	44.4	LOW	LOW	LOW	33.0	29.5	LOW	MOD
BCDE	GoSoy GS48X19	61.1	49.5	45.9	LOW	LOW	49.5	45.9	LOW	LOW	MOD	41.1	36.8	LOW	HIGH
BCDE	LG Seeds 4931RX	61.1	52.0	47.7	MOD	LOW	52.0	47.7	MOD	LOW	LOW	33.5	31.8	MOD	MOD
BCDE	AgriGold G4620RX	61.0	45.5	43.3	LOW	LOW	45.5	43.3	LOW	LOW	LOW	34.5	33.5	LOW	MOD
BCDE	Dyna-Gro S46XS60	61.0	50.6	46.0	LOW	LOW	50.6	46.0	LOW	LOW	LOW	34.9	31.4	MOD	MOD
BCDE	USG 7496XTS	60.8	45.9	46.2	MOD	LOW	45.9	46.2	MOD	LOW		27.4	26.7	LOW	MOD
BCDE	Progeny 4821RX	60.7	49.5	46.5	LOW	LOW	49.5	46.5	LOW	LOW	LOW	34.7	33.7	LOW	MOD
CDEF	Taylor Seed 4880XS	59.5	41.7	41.5	LOW	LOW	41.7	41.5	LOW	LOW	LOW	29.3	26.7	LOW	MOD
CDEF	Taylor Seed 4990XS	59.3	44.2	44.3	MOD	LOW	44.2	44.3	MOD	LOW	LOW	29.8	26.0	LOW	MOD
DEF	Armor X48-D25	58.9	49.8	44.4	LOW	LOW	49.8	44.4	LOW	LOW		29.3	23.0	LOW	MOD
EF	Armor X46-D09	58.7	55.0	50.7	MOD	LOW	55.0	50.7	MOD	LOW	LOW	31.8	26.7	LOW	MOD
EF	Credenz 4770X	58.6	41.7	42.7	LOW	LOW	41.7	42.7	LOW	LOW	LOW	30.8	29.8	LOW	MOD
F	Credenz 4600X	55.7	46.4	40.1	LOW	LOW	46.4	40.1	LOW	LOW	MOD	37.9	33.0	LOW	MOD
	Average	62.0	49.1	46.3			49.1	46.3				33.9	30.3

YLD= Avg. Yield @ 13% moisture MS= Varieties that have any MS letter in common are not statistically different in yield at the 5% level of probability.   *Treated plots sprayed with Quadris TOP SBX @ 7 oz./Acre + 0.25% Induce @ R3 growth stage. RECM varieties planted June 3,  sprayed Aug 12,  and harvested Nov 5. JAX1 planted June 2, sprayed Aug 10, and harvested Oct 10. JAX2 varieties planted after wheat June 26, sprayed Aug 25, and harvested Nov 6.   LOW, MOD, and HIGH is a relative ranking of disease severity at each location. No rating data in SDS column indicates none was observed or not consistant enough to rate. Disease ratings at RECM: Frogeye leaf spot ranged from 0 – 4% with an average of 2%; Target spot was ranged from 0 – 0.5% with an average of 0.02% Disease ratings at JAX1: Frogeye leaf spot ranged from 0 – 6% with an average of 2%; Target spot ranged from 0 – 11% with an average of 1%; Sudden death syndrome (SDS) index ranged from 0 – 18 with an average of 3.4. Disease ratings at JAX2: Frogeye leaf spot ranged from 0 – 5% with an average of 2%; Target spot was not observed; soybean rust ranged from 18 – 55% with an average of 31%   Disease ratings & yield data compiled by Dr. Heather Kelly & Alyson Horner from replicated plots at the Research and Education Center at Milan, the West Tennessee Research and Education Center, and on-farm location in Jackson. County data provided by Ryan Blair, Ext. Area Specialist, and the extension agents.