The 2012 growing season is well under way. The spring planting progress has been at a record pace, a consequence of a very dry fall and winter and a very warm March. Winter wheat has very little winter injury and stands are generally very good.
The winter wheat crop is at or near jointing and some of the earliest spring wheat fields are not far behind. This means that it is time to start scouting for early season tan spot.
To aid in your decision whether a fungicide is needed to control early seaon tan spot you can go to http://mawg.cropdisease.com to evaluate the risk that conditions are favorable for tan spot to develop. Make sure to select the model for tan spot in the left hand model.
An overview article of control of early season tan spot can be found here:
Be aware that tank mixing fungicide with certain herbicides can result in temporary crop injury. See here for details here http://www.plantmanagementnetwork.org/sub/cm/research/2011/mixing/ and http://blog.lib.umn.edu/efans/cropnews/2011/06/early-season-tan-spot-and-risk.html