Soybean Disease

C.O.R.N. Newsletter Articles

  1. Early Yellowing Soybeans

    Author(s): Anne Dorrance

    Soybeans across the state range from ready to harvest to still flowering.  But in some fields, the yellowing was limited to pockets - some was sudden death syndrome or brown stem rot, charcoal rot, Phytophthora stem rot, and soybean cyst nematode.  There are some other early yellowing situations that we are still working on an accurate diagnosis, but yellowing in these cases may be linked to fertility issues and/or related to late flooding injury.  I think in 2018 we’ve observed just about everything, and it was all dependent on where in the state the soybeans were grown, how much rain occu

    Issue: 2018-29

  2. Soybean Disease Outlook for August

    Author(s): Anne Dorrance

    We have soybeans in all different growth stages but the majority of the crop looks great but there are a few highlights based on some scouting and reports from last week.

    Issue: 2018-26

  3. Only Susceptible Varieties are Prone to Diseases and May Require a Fungicide Application

    Author(s): Anne Dorrance

    From the scouting reports from the county educators and crop consultants – most of the soybeans in the state are very healthy with no disease symptoms.  However, as the news reports have indicated, there are a few varieties in a few locations that have higher incidence of frogeye leaf spot than we are accustomed to seeing at this growth stage – mid R2 – flowering in Ohio.  Most of the reports to date are along and south of route 70, which based on the past 12 years is where frogeye is the most common.  When this disease occurs this early in the season, where it can be readily observed, this

    Issue: 2018-21
  4. Whiskers a.k.a. conidia of Cercospora sojina that causes frogeye leaf spot

    We have found some whiskers! (Spores of Cercospora sojina)

    Author(s): Anne Dorrance , Author(s): Linda Weber

    Last week, samples of frogeye leaf spot of soybean were brought into the lab.  On the underside of the characteristic lesion were the conidia.  This came from an area where the incidence of frogeye was notable at the end of the season.  For the 2018 season a susceptible variety was planted back into that same field.  Environmental conditions have been favorable for this disease to begin in some areas of the state.

    Issue: 2018-19

  5. It’s probably not Frogeye Leafspot and no Brown Spot IS NOT an economically important disease

    Author(s): Anne Dorrance

    As farmers and consultants have been out checking their soybean stands, they are finding spots on the leaves.  The most common spotting on the unifoliates and first leaves is caused by Septoria glycines.  This is a fungus that overwinters on the previous soybean crop residue and in modern cultivars it is limited to the lower canopy.  We’ve done extensive studies on this disease over the past decade and I have yet to attribute an economic value in managing this.  We did this one experiment where put chlorothalonil on every week (not a legal application but for research purposes only

    Issue: 2018-18
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Publications

  1. Managing Soybean Rust, Bulletin SR2008

    Managing Soybean Rust, Bulletin SR2008. Publication covers specifics of soybean rust identification and  management. General section of the publication cover the use of fungicide sin general for disease control including description of products and their activity, application information and modes of action.

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