Table 7. 2018 MG-3 Roundup Ready Disease Tests

Table 7. Yields and disease ratings of 8 Maturity Group III Roundup Ready soybean varieties in 8 County Standard Tests and in small plot trials at one Research and Education Center and one on-farm location in Tennessee during 2018

Summary from County TestsSummary from Small Plot Research
Research and Education Center at Milan (RECM)On-farm Location in Jackson (JAX)
MSVarietyAvg. Yield (bu/ac)*TreatedNon-treatedFrogeye leaf spotTarget SpotOther Diseases*TreatedNon-treatedFrogeye leaf spotTarget Spot
AAgriGold 372266.657.149.6LOWMODCLB62.158.4LOWLOW
AAsgrow 39X7*64.557.743.6HIGHMODSC58.050.6HIGHMOD
ABAsgrow 37X863.753.747.1MODMODSC51.251.0MODMOD
ABCAsgrow 36X6*62.356.553.6MODMODCLB59.053.0MODMOD
BCAsgrow 38X860.156.850.0LOWHIGHCLB56.051.1LOWMOD
CDyna-Gro S39XT0859.154.548.4HIGHMODSDS55.350.4HIGHLOW
CNK S39-P5X59.152.845.2MODLOWCLB, SDS55.755.2HIGHLOW
CWarren Seed BG 382158.952.748.6HIGHHIGHSC, CLB52.444.2HIGHHIGH


YLD= Avg. Yield @ 15% moisture

MS= Varieties that have any MS letter in common are not statistically different in yield at the 5% level of probability.

Varieties denoted with an asterisks (*) or (**) etc. were in the top performing group for consecutive years.

County locations include: Chester, Fulton KY, Gibson, Henry, Hickman, Jefferson, Madison, Weakley

*Treated plots sprayed with Quadris TOP SBX @ 7 oz./Acre + 0.25% Induce @ R3 growth stage. RECM varieties planted June 5 and JAX planted June 14

LOW, MOD, and HIGH is a relative ranking of disease severity at each location. Other diseases noted: SC=Stem Canker, CLB=Cercospora Leaf Blight, SDS=Sudden Death Syndrome;  ‘ – ‘ indicate variety was not tested at that location

Disease ratings at RECM: Frogeye leaf spot ranged from 0 – 15% with an average of 6%;  Target spot ranged from 0 – 18% with an average of 9%.

Disease ratings at JAX: Frogeye leaf spot ranged from 0 – 9% with an average of 4%; Target spot ranged from 0 – 23% with an average of 10%; other diseases were not rated or noted at this location for this maturity group

Disease ratings & yield data compiled by Dr. Heather Kelly from replicated plots at the Research and Education Center at Milan and on-farm location in Jackson.

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

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