The brown spot pathogen, the fungus Septoria glycines, is common in soybean residue and spreads from the soil to young soybean plants by splashing rain. Infection occurs as early as the V2 growth stage on lower leaves, causing small, irregularly shaped brown spots or lesions (Figure 1).
By Alison Robertson, Department of Plant Pathology and Microbiology
In the past 5 years, Goss’s wilt and leaf blight has become increasingly prevalent in Iowa. This growing season, the disease has already been reported from several fields. Consequently many agronomists and scouts have been checking fields and some agronomists have been making use of the immunostrip test from AgDia.
What symptoms should you be looking for?
