May 19 Wheat Update
Damage to heads from frost/freeze is beginning to appear as white awns/florets in wheat heads. Thankfully this damage is very minor in area wheat fields right now.
Barley yellow dwarf is also appearing in fields and is noticeable by flag leaves with a yellow/purple color. This is a disease vectored by various aphid species. The aphid in this photo is a corn leaf aphid and I’m seeing these in wheat as well right now in addition to lady beetles which are feeding on them. We also observed aphids last fall and were concerned about them potentially vectoring this disease. I would say this is my least favorite wheat disease because you can do many things correct with wheat just to have this one show up and affect yield.
Stripe rust and leaf rust are also rapidly increasing in area fields with the humidity and moisture this past week. Fungicide options differ right now dependent upon wheat growth stage.
Also seeing some loose smut in fields which again is fairly minor. Both loose smut and stinking smut (common bunt) can be prevented by using a seed treatment fungicide at planting. Often these diseases occur in fields where wheat has been planted and smut has occurred before and when using bin-run wheat that has not been treated with a seed treatment fungicide. Also notice all the yellow ‘flecks’ on these leaves which are indicative of fungal infection (most likely rust) on these leaves.
Posted on May 19, 2017, in Crop Updates and tagged barley yellow dwarf, frost damage, leaf rust, Loose Smut, stripe rust, wheat, Wheat Diseases, wheat heading. Bookmark the permalink. 2 Comments.
Surprising how quickly a frost can do damage. And yet the insects remain persistent. Thanks for all the great posts to help farmers continue to learn about new situations that arise in the field.
Thanks Dennis! Hope all is going well for you!