The spring is off to a slow start, but wheat is progressing and now is a great time to review the Purdue Extension publication ID-422 “Managing Wheat by Growth Stage”. <http://www.extension.purdue.edu/extmedia/ID/ID-422.pdf>
Herbicide, fungicide, and fertilizer applications are most efficacious when applied at the correct growth stage. This publication describes the key wheat growth stages and provides images to help with accurate growth stage identification. The bulletin also provides a printable one-page table that outlines management decisions by growth stage.
Source : purdue.edu