If your walnut tree is a Black Walnut, Juglans nigra, there is a very serious disease of this species that is moving through the mountain states at this time. The disease is called 1000 Canker and is spread by the walnut twig beetle, which introduces fungal pathogens to the trees.

This disease complex so far does not appear to affect other species of walnut trees. See the link for a detailed description of the disease, the beetle, etc.

Here is a link that might be useful: 1000 Canker Disease of Black Walnut

put it outside, it is summer

goldfishgray,

Your post must have been meant for some other thread. It doesn't seem relevant here.
___________________________________________________________

rclloyd,

Call your county extension office and see if they can be of help. They should be familiar with diseases present in your area. They'll be able to look at your tree either on-site or examine a specimen you bring to their office for an up-close look.

Here is a link that might be useful: Locate Your Idaho Extension Office