By Anne Dorrance, Ohio State University Extension plant pathologist
We have multiple planting dates in Ohio this year with soybeans in all different growth stages. This can create challenges when management decisions are based on the stage of crop development.
For soybeans that are flowering, there was a confirmed report of frogeye leaf spot. If the soybeans in the field are in good health then managing this disease is often cost effective on susceptible varieties. Scouting between R2/R3, if frogeye is easy to find on the newly expanded leaves a fungicide application is warranted. There are many fungicides available with fair to very good efficacy. The one caveat is in Ohio we have identified strains of the fungus that causes frogeye leaf spot that is resistant to strobilurin fungicides, so choose a product that has another mode-of-action.
For soybeans that are in the early seedling stages that have continued to get these saturating rains, damping-off is occurring.… Continue readingRead More »