At a quick glance it looks like a sign of autumn, but a condition called iron chlorosis is plaguing trees throughout the Front Range and turning their leaves an unhealthy yellow.
“This is quite possibly the most common question that comes into our office,” said Joel Reich, horticulture agent with the Colorado State University Extension in Boulder County.
Reich estimated that at least 3,000 trees in Longmont — and thousands more outside the city — suffer from iron chlorosis, an iron deficiency that causes the leaf tissue to turn yellow while the veins remain green.
Left untreated, the leaves will continue to pale until they turn nearly white.
“Once they’re that whitish condition, the sun just scorches them,” Reich said.
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