Soybean rust making a late run in the south

By Anne Dorrance, David Dugan, Greg LaBarge, Ohio State University Extension

Soybean rust is making a late breaking appearance in many of the southern states, both those that border the Mississippi river as well as Georgia and South Carolina (http://sbr.ipmpipe.org/cgi-bin/sbr/public.cgi?host=All%20Legumes/Kudzu&pest=soybean_rust&language_sel=1).  Some of these developments were the result of Hurricane Isac back in early September and some were there before this storm.   have started to receive some samples of leaves — just to see if the spores could make it to Ohio on the back of a hurricane. This information is important to have for the year when a hurricane might hit in July, with the same level of rust in the south. It helps develop the models that can help us with management in the future. As of today, no soybean rust was found on these leaves collected from fields in Brown, Highland, Wood, Hardin, Hancock and Union counties. If any fields survive the freeze this week, we may try again next week.

From these samples there were lots of leaf spots including: bacterial leaf blight, downy mildew, Septoria, Cercospora leaf blight, frog eye leaf spot, and Phyllosticto leaf spot. There was also some evidence of soybean virus diseases including soybean necrotic vein virus and bean pod mottle virus. Interesting there were aphids on the leaves collected in southern Ohio. There were also assorted other ‘fauna’: thrips, mites, and bean leaf beetles to name a few.