Weidner: Have you noticed the yellowing trees?

It’s still a touch too early for fall color, but some of our landscape trees are certainly changing and it’s not a good thing. While this change in color at this time of year isn’t something homeowners like to see, it is unfortunately rather prevalent. The yellowing is generally referred to as chlorosis. Trees in Colorado often deal with iron chlorosis, but can also be susceptible to zinc, manganese, and nitrogen deficiencies, which can cause similar effects.