Soybean varieties respond to white mold pressure

Bob Battel, Michigan State University Extension - September 25, 2013

Wet, cool late summer conditions induce a white mold variety trial in Sanilac County.

Thumb Ag Research and Education (TARE) personnel established a soybean variety plot north of Sandusky. The plot has been under white mold pressure in 2013. Plots are planted in six 30-inch rows, 90 feet long. The plots were established on a Parkhill Loam on May 27, 2013 3 miles north, and one mile east of Sandusky.

The plot is not irrigated. Significant rain events recorded at the MSU Enviro-weather station, one mile to the southwest of the plot, included 1.64 inches, July 8-10; 1.21 inches, July 31-Aug. 2; and 1.00 inches August 6-August 8. The weather station recorded rainfall each day for the period of Aug. 30 – Sept. 8, for a total of 0.54 inches.

Varieties were planted in five trials – Group 1.9 and Less (20 varieties), Group 2.0-2.2 (26 varieties), Group 2.3 and Greater (32 varieties), Conventional (non-Roundup Ready) (13 varieties), and Liberty Link (7 varieties). Trials were replicated four times.

Varieties were scored for white mold on a 0-5 rating on Sept. 17, 2013. The average plant population at the time of rating was 110,000 plants per acre. Soybeans were in the R6 growth stage. The field has a historically high incidence of white mold. The rating scale was:

0 – No infections on any plants

1 – Fewer than 10% of plants infected

2 – 11-20% of plants infected

3 – 21-30% of plants infected

4 – 31-40% of plants infected

5 – 41% or more of plants infected

TARE Personnel walked through the center of each plot replicate (between rows 3 and 4), and scores were given based on the severity of infection in those two rows. Each of the four replicates was averaged for final results.

White mold pressure was variable throughout the plot. The southeast corner of the field had light pressure, and pressure increased on the west end of the field. The Conventional trial was under light white mold pressure, the Group 2.0 – 2.2 and Liberty Link trials were under moderate/light pressure, and the Group 1.9 and Less, and Group 2.3 and Greater trials were under moderate/severe pressure.

The following tables, presented in order of least severe to most severe infection, show soybean variety response to white mold pressure.

Conventional Soybeans
Variety	White Mold Rating
ZFS Select 251 LS	0.00
Organic Bean & Grain MK9101	0.00
DF Seeds 155F	0.00
DF Seeds JACKSON F	0.00
DF Seeds LILLY	0.00
ZFS Select e2611	0.00
Organic Bean & Grain 52020	0.25
DF Seeds 242 N/S	0.25
Organic Bean & Grain DH530	0.25
Organic Bean & Grain DH410	0.50
ZFS Select 1326	0.50
ZFS Select 728 LL	0.75
Organic Bean & Grain MK1016	0.75

Group 2.0-2.2 RR Soybeans
Variety	White Mold Rating
NuTech/G2 Genetics 7213	0.50
Stine Seed 22RD00	0.75
NuTech/G2 Genetics 7208	0.75
Stine Seed 20RD20	0.75
NK Brand S20-T6	0.75
Rupp Seeds Inc. RS 7212N	0.75
Great Lakes Hybrids 2019	0.75
NK Brand S22-S1	1.00
Croplan Genetics R2C2263	1.00
Mycogen Seeds 5N210R2	1.00
Mycogen Seeds 5B241R2	1.00
DF Seeds 5211 N R2Y	1.00
Specialy Hybrids 2218CR2	1.00
Dyna-Gro 35RY21	1.00
Asgrow AG2232	1.00
Asgrow AG2031	1.00
Channel Seeds 2207R2	1.25
Dyna-Gro S20RY94	1.25
Croplan Genetics R2C2072	1.25
Great Lakes Hybrids 2069	1.25
Dairyland Seeds 2105	1.25
Hyland Seeds HS 22RYS03	1.25
NK Brand S20-Y2	1.25
Asgrow AG2134	1.25
Great Lakes Hybrids 2289	1.25
Dyna-Gro S22RY64	1.50

Liberty Link Soybeans
Variety	White Mold Rating
DF Seeds 9221 N LL	0.00
DF Seeds 9181 N LL	1.00
NuTech/G2 Genetics 3243L	1.50
DF Seeds 9251 N LL	1.75
NuTech/G2 Genetics 3223L	1.75
DF Seeds 9261 LL	1.75
NuTech/G2 Genetics 3273L	2.00

Group 2.3+ RR Soybeans
Variety	White Mold Rating
NuTech/G2 Genetics 7230	1.25
Stine Seed 24RD03	1.50
Specialty Hybrids 2595CR2	1.50
NuTech/G2 Genetics 7261	1.75
Hyland Seeds HS 24RY05	1.75
NuTech/G2 Genetics,7240	1.75
Channel Seed 2505R2	1.75
Asgrow AG2433	1.75
Asgrow AG2632	1.75
Hyland Seeds 249YSO1	1.75
Dyna-Gro S25RY44	2.00
Channel Seed 2305R2	2.00
Great Lakes Hybrids2569	2.00
Croplan Genetics R2C2423	2.25
Croplan Genetics R2C2633	2.25
NK Brand S25-E5	2.25
NuTech/G2 Genetics 7250	2.25
Rupp Seeds 7xp 220N	2.25
Beck's Superior Hybrids 229NR	2.25
Specialy Hybrids 2480CR2	2.25
Beck's Superior Hybrids 241NR	2.25
Dairyland Seeds DS2340	2.50
Channel Seed 2306R2	2.50
Dairyland Seeds 2411	2.50
Rupp Seeds 7251N	2.50
Great Lakes Hybrids 2319	2.50
Hyland Seeds HS 26RYS16	2.75
Mycogen Seeds 5B255R2	2.75
DF Seeds 5252 N R2Y	2.75
DF Seeds 5263 R2Y/STS	3.25
Dyna-Gro S24RY73	3.25
Asgrow AG2933	4.75

Group 1.9 and Less Soybeans
Variety	White Mold Rating
Rupp Seeds7xp 284N	1.00
Dyna-Gro S19RY84	1.50
Great Lakes Hybrids 1689	1.50
NuTech/G2 Genetics 7183	1.75
Croplan Genetics R2C1972	1.75
Dyna-Gro S18RY33	1.75
Great Lakes Hybrids 1849	1.75
Stine Seeds 16RA02	2.25
NuTech/G2 Genetics 7171	2.25
DF Seeds 5193 N R2Y	2.25
Asgrow AG1832	2.50
Rupp Seeds 7172N	2.50
Specialty Hybrids 1844CR2	2.75
Dairyland Seeds 1808	3.00
Hyland Seeds HS 11RY07	3.00
Great Lakes Hybrids 1929	3.00
Dyna-Gro 34RY17	3.25
Hyland Seeds HS 18RY09	3.75
NK Brand S17-B3	4.25
Hyland Seeds HS 18RYS13	4.25

This article was published by Michigan State University Extension. For more information, visit https://extension.msu.edu. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464).