I’d suspect, as an alternative, sunburn of younger limbs adopted by borer issues early to midsummer. When pistache is younger, it’s reasonably a scraggly, open tree that fills in later.
If there may be proof of borer issues (bark lifting, solar injury to the higher sides of limbs, west or south exposures which can be open to the solar), then apply borer management pesticides (they comprise imidacloprid within the lively elements) as a soil drench across the tree base, and see if the tree recovers over the following couple of years.
Q: I’ve a row of wax leaf privets I’m attempting to irrigate. I used to make use of wooden chips round these vegetation however was nervous about choking them. At present, I exploit two 4-gallons-per-hour drip emitters watering for one hour as soon as per week. The tops are beginning to die again and I’m questioning if it’s a watering drawback.
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