Please offer diagnosis of client complaint regarding young fir. Client identifies it as a white fir. Fir has experienced steady, good growth and color. Symptoms appeared about July of this year. Symptoms occurred about the time of a significant heat wave with temps in upper 90s and low 100s. Symptoms seemed to stabilize by late summer. Many if not most of this-year needles are yellow only part way down. Symptoms fairly uniform over canopy. Slight yellowing of a few older needles. Some impacted needles dropped. Drip irrigation is used about once a week during summer. Soil very porous consisting of many cobbles and smaller stones. Fairly large mushrooms present under canopy. Neighbors building and parking lot was developed three to five years ago. Neighbor did use glyphosate along fence line before symptoms appeared. Not sure of timeline of herbicide application or if it was during heat wave. Inspected trunk, branches and twigs and did not find find other symptoms or sign, but willing to go return with more knowledge. -- Thanks, David Cowan, Master Gardener