Verticillium wilt is a soil-borne fungus that attacks a tree's water-conducting tissue from the inside, and it's one of the trickier problems ArborSafe diagnoses on Treasure Valley maples and ash trees. It doesn't announce itself the way an insect infestation does.
Instead, it often shows up as one branch or one side of the canopy wilting or dying back while the rest of the tree looks healthy, frequently worsening during hot, dry stretches. Because the fungus lives in the soil, it can affect a tree for years before symptoms become obvious.
There is no cure once a tree is infected, but the progression can often be slowed with proper watering, fertilization, and pruning of affected limbs. Catching it early gives a tree its best chance at a longer, more stable decline.
Nampa, Caldwell, and Meridian homeowners noticing uneven dieback can request a diagnosis before it spreads further.
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Authentic photo of a maple or ash showing one-sided wilting or dieback, with the healthier side of the canopy visible for contrast.
Canva text suggestion: "A threat that hides in the soil" or "One side wilting, one side fine"