The current dry spell has probably saved a lot of wheat yield. Unless stunting and lack of tillering caused by these viruses were severe, infected wheat should have recovered this past week or so. Dr. Gene Milus now expects leaf rust will not be a problem in Arkansas this year in time to hurt the crop. None has been found in the state and the weather is too warm. Keith Driggs reports some on N K Coker 9663 and Pioneer Variety 2684 in Arkansas County as high as the leaf below the flag leaf but scattered.
Most reports statewide have it still on the lower leaves and static.
I would wait as long as possible to decide about spraying but doubt you will need to unless we get some rain very soon. Gary Huitink has a true no-till wheat experiment at the Northeast Research and Extension Center that has an epidemic of tan spot disease on the lower and middle leaves. If you are not familiar with this disease of no-till wheat and would like to see it, this would be a good spot to visit. Good Work, Gary. Keith Martin and I looked at a couple of wheat fields in Mississippi County where the leaves were desiccated and shredded at the tips, almost exclusively along the edges of the fields next to recently leveled farm roads, planted rice fields or other exposed soils.