Entries by damonsmith

Soybean Vein Necrosis Disease and New Video Released

Kiersten Wise, Daren Mueller, Iowa State, and Damon Smith, Wisconsin Soybean Vein Necrosis Virus (SVNV) causes a virus disease in soybean that has been observed across the North Central U.S. in the last few years. The following video describes how to accurately diagnosis SVNV and distinguish this disease from other common soybean diseases. Symptoms caused […]

Stem Canker Prevalent in Wisconsin Soybean Fields

Damon L. Smith – Extension Field Crops Pathologist, University of Wisconsin While traveling to soybean fields around Wisconsin this past week, we have noticed quite a bit of stem canker showing up. The UW Disease Diagnostic Clinic has also received several samples of soybean in which the disease has been confirmed. Stem Canker Pathogens There […]

Wisconsin Corn and Soybean Disease Update – August 21, 2014

Damon L. Smith – Extension Field Crops Pathologist, University of Wisconsin I have spent the last several days rating and scouting corn and soybeans in the southern tier of Wisconsin. There are a few active diseases out there to keep track of. Field Corn In field corn we have found a few fields with low […]

Goss’s Wilt Confirmed for First Time in 2014 in Wisconsin

Damon Smith, Extension Field Crops Pathologist, Department of Plant Pathology, University of Wisconsin-Madison This week the University of Wisconsin Plant Disease Diagnostic Clinic confirmed Goss’s wilt in dent corn from Grant County in Wisconsin. Goss’s wilt has been confirmed in past years in Wisconsin, but this is the first confirmation of the disease for the […]

Alfalfa mosaic virus on Soybean in Wisconsin

Damon Smith, Extension Field Crops Pathologist, Department of Plant Pathology, University of Wisconsin-Madison Calls, photos, and plant samples have been coming in over the last week (8/1/2014) pertaining to soybeans exhibiting abnormal growth and varying degrees of leaf mosaic (interwoven green and yellow areas).  These symptoms are indicative of Alfalfa mosaic virus (AMV) on soybean. […]

Wisconsin Soybean Phytophthora Root Rot Survey Update

Anette Phibbs, Plant Pathologist with the Wisconsin Department of Agriculture and Consumer Protection, reports that the 2014 survey of early vegetative soybeans shows high levels of Phytophthora root rot disease caused by Phytophthora sojae. Nearly half of soybean fields sampled from June 6 to July 16 in 35 surveyed counties were infected with this fungus-like […]

Cercospora Leaf Blight and Purple Seed Stain of Soybean

Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin Over the last several weeks, soybean samples have been coming into the Plant Disease Diagnostic Lab with symptoms of Cercospora leaf blight (CLB).  I have also received numerous questions about the disease and have observed CLB in several soybean fields around the state. What does […]

Tasseling Corn – Scout Now for Foliar Diseases and What About Fungicide?

Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin I have been riding through much of the southern tier of Wisconsin this week and am noticing quite a few corn fields that are beginning to tassel. This growth stage presents itself as a good time to scout for foliar diseases of corn and make […]

Fusarium Head Blight and Other Winter Wheat Diseases in Wisconsin, 2014

Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin-Madison Shawn P. Conley, Extension Soybean and Small Grains Agronomist, University of Wisconsin-Madison Winter wheat in most of Wisconsin is maturing nicely and starting to dry down in the southern portions of the state.  For most of the season, wheat diseases have been at low levels […]

Managing White Mold in Soybean

Damon Smith, Extension Field Crops Pathologist, University of Wisconsin Kiersten Wise, Extension Specialist for Field Crop Diseases, Purdue University Martin Chilvers, Extension Field Crops Pathologist, Michigan State University Carl Bradley, Extension Plant Pathologist, University of Illinois Daren Mueller, Extension Plant Pathologist, Iowa State University Farmers in the Great Lakes area of the U.S. may be […]