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 TestsSummary from Small Plot Research
Avg.On-farm Location in Jackson (JAX)Research & Education Center at Milan (RECM)Soybean
YieldYield (bu/ac)FrogeyeTargetBrownYield (bu/ac)FrogeyeTargetBrownOtherCyst
MSVariety(bu/ac)*TreatedNon-treatedleaf spotspotspot*TreatedNon-treatedleaf spotspotspotDiseasesNematode
AAgriGold G3722RF***58.149.247.7NONEHIGHLOW57.353.1NONEMODMODMR
ABAsgrow 38XF157.644.744.9NONEMODLOW57.951.5NONEHIGHMODR
ABNK 39-A1XF56.044.637.5HIGHHIGHLOW51.845.5MODHIGHLOWR
ABAsgrow 36XF155.546.343.1MODMODLOW56.950.3LOWMODMODR
ABCLocal Seed LS3908XFS54.251.950.1LOWNONELOW56.455.1NONELOWHIGHR
BCAsgrow 37XF150.141.037.3LOWHIGHLOW53.149.1LOWMODLOWR
CAgriGold G3630XF47.538.933.6MODLOWLOW55.850.5MODNONEHIGHSDSR
Average54.145.242.055.650.7

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

Virginia Sykes
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