Thousand cankers diseases kills walnut and butternut trees. The first signs are yellowing or wilted leaves in the canopy. Once the symptoms are seen it's too late to save the tree.

While the trees spring up northward, rising temperatures would stress established black walnut trees in the southeast, making them more vulnerable to diseases like thousand cankers disease.

The problem with leaving the diseased trees standing is the mobility of the walnut twig beetle (Pityophthorus juglandis), which carries the fungus, Geosmithia morbida, from tree to tree.

The walnut problem is not overwhelming tree trimmers yet, said Justin Irvin, spray supervisor for Hayes Tree Service in Boulder. “I haven’t heard anything about it,” he said.

LANSING, MI -- Attention woodlot owners: Be wary if someone shows up on your doorstep or calls offering to buy your black walnut trees because of the recent detection of a tree-killing disease ...

Everything you always wanted to know about walnut trees Generally, if a single existing tree does not bloom or produce seeds well, it means that some other health factor is involved.

Spots where trees have been removed will be assessed for replanting with a designated street tree or even a walnut, but the kind without nuts that cause problems to neighbors with mobility problems.

What’s yours? Q: A huge walnut tree is growing in a wild backyard across the high fence from my property. Its canopy reaches into our yard creating dense shade.

Landscaping under any tree can be challenging, thanks to the dense shade cast by the branches and the abundance of thick roots in the soil. But black walnut trees (Juglans nigra) seem to be in a ...

Walnut trees are pretty good about defending their territory with a chemical that kills or stunts a lot of other plants. And they're equal-opportunity killers -- sometimes wiping out natives ...

Warmer, drier summers and extreme weather events considered possible as the climate changes would be especially troublesome -- possibly fatal -- for walnut trees, according to researchers.

Many Midwestern yards are adorned by black walnut trees. The black walnut (Juglans nigra) is a large, handsome native tree that bears edible nuts. There’s just one problem with black walnuts:… ...