Entries by damonsmith

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 […]

Phytophthora Root Rot of Soybean Confirmed in Several Wisconsin Counties

Anette Phibbs, Plant Pathologist with the Wisconsin Department of Agriculture and Consumer Protection, reports that preliminary results of the DATCP soybean survey show a lot of root rot disease (Phytophthora sojae) presently active in the state. From June 6 to 25, the pest survey team sampled 19 fields in 13 counties. Soybeans were in the […]

Wisconsin Winter Wheat Disease Update-June 27

Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin My graduate students and I scouted and rated Shawn Conley’s State Uniform Winter Wheat Variety Trial at the Arlington Agricultural research station located in Columbus, County Wisconsin yesterday (June 26).  We were able to find leaf rust in many plots with incidence of this rust […]

Evaluation of fungicides for control of foliar diseases of Alfalfa at cutting #1 in Wisconsin, 2014

Damon L. Smith, Extension Field Crops Pathologist, University of Wisconsin Scott Chapman, Research Associate, University of Wisconsin Bryan Jensen, IPM Program, University of Wisconsin An evaluation of foliar applied fungicides for control of diseases of alfalfa was implemented in Wisconsin in 2014.  This work is a continuation of fungicide evaluation that has been ongoing since […]

Wisconsin Winter Wheat Disease Update – June 24, 2014

Damon L. Smith – Extension Field Crops Pathologist, University of Wisconsin I have spent the last several days rating winter wheat variety trials and fungicide trials at the Arlington Agricultural Research Station in Arlington, Wisconsin, Columbia Co.  Wheat in this area is mostly in the mid-to-late milk stage. Leaf rust was observed at low levels […]