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Have your agronomic questions answered by a Farm Journal agronomist. E-mail us directly at TestPlots@FarmJournal.com, and we’ll respond on this blog to provide an interactive dialogue.

Do You Recommend Applying Fungicides On Wheat At Green-Up?

Mar 14, 2011

Question: Is there an advantage to applying fungicides on wheat at green-up?  Wheat here has just had nitrogen applied, and growth has really started to jump.  Some consultants are recommending an insecticide and Headline. Some are seeking Prosaro to apply. Wouldn't a fungicide be more beneficial at flag leaf?

Answer: Without knowing the specific region the wheat is planted in and additional information such as the density of the wheat, wheat variety and the specific disease/insect pressure, it’s hard to make any kind of accurate recommendation. However, if the grower or agronomist is scouting the field and finds threshold levels of aphids (5+ in the early spring) or other insects at economic thresholds, then the application of an insecticide would be recommended.
 
If the wheat is dense and early-season diseases are visible within the canopy, or the variety planted is susceptible to mildew, tan spot, early rust or septoria (these diseases may be specific by the region), then an application of a fungicide early would likely be a good economic decision. Single fungicide applications early in the season have been found to increase yields by 5-7% many times, even at lower rates. These early applications are not a substitute for later season fungicides, however, because fungicides applied at flag-leaf emergence to early heading are timed to protect the flag leaves and grain heads from diseases, preferably all the way through the completion of grain fill.
 
These steps help wheat growers improve stands and, ultimately, yield results.
 
This blog is provided as an interactive way for you to have your questions answered by our Farm Journal Agronomists. E-mail your nitrogen, soil fertility, soil density, planter set-up, scouting, and other questions to: TestPlots@FarmJournal.com.
 
 
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