Efficacy of Seed Treatment Fungicides for Soybeans in Ohio
Patrick E. Lipps, Anne E. Dorrance, Landon
H. Rhodes and Dennis R. Mills
Department of Plant Pathology
The Ohio State University
Seed treatment fungicides are useful tools to manage seed and soil borne pathogens. Seed treatments are highly recommended in Ohio on seeds of corn, soybeans, small grains and alfalfa. However, a specific fungicide will not control all of the pathogens that may be present. It is important that agronomic crop producers know what the pathogens are in specific fields in order to choose the best fungicide or combination of fungicides for that field. In addition, the correct choice of fungicide will also limit losses due to seed-borne pathogens. The same rule applies in that specific fungicides will not effectively control all seed-borne pathogens. Refer to Extension Bulletin 639 Seed Treatment for Agronomic Crops for more detailed information concerning seed and seedling diseases affecting field crops in Ohio.
The following table lists the effectiveness or efficacy of fungicide seed treatments for soybeans. This table is based on field trials where these fungicides have been evaluated under very high disease conditions. The listed products may be applied in various combinations within limits of the label. Using combinations of fungicides will broaden the effectiveness against several different diseases.
Disclaimer
The information provided herein is supplied with the understanding that no discrimination is intended and no endorsement by the Ohio State University Extension is implied. The authors have assembled the most reliable information at the time of publication. Due to changing laws and regulations, the Ohio State University Extension assumes no liability for the recommendations.
Relative
efficacy of fungicide seed treatments for control of certain diseases of
SOYBEANS in Ohio
| Trade Name | Active Ingredient | Phomopsis seed rot | Phytophthora damping off | Pythium damping off | Rhizoctonia seedling blight |
| Allegiance | Metalaxyl | N | E* | E | N |
| Apron XL | Mefenoxam | N | E* | E | N |
| Maxim | Fludioxonil | E | N | N | G |
| SoyGard | Metalaxyl, Azoxystrobin | P | F | G | G |
| YieldShield | Bacillus pumilus | N | N | N | F |
Efficacy based on labeled rates of
active ingredient for each material.
Efficacy rating scale: E=excellent, G=good, F=fair, P=poor, N=no activity,
ND=no data
* Control of Phytophthora damping off only at the higher labeled rates. Low
rates of Metalaxyl and Mefenoxam do not control Phytophthora
but they do control Pythium.