Asked June 22, 2022, 12:27 AM EDT
OSU Expert,
I read your article "Diagnosis table — Douglas-fir, oak and pine". Believe our backyard 12-ft tall 3 pine trees are experiencing various degree of sickness. One tree crown was light green in the winter and now turned mostly brown. Next to it is a Cryptomeria, and next are two more pine trees. These two look still healthy gree, but i can tell one pine's needles are slightly lighter green. All three pine trees have some branches with brown needles (in the lower part of tree). An arborist (from Urban Forest Pro) came couple of days ago and told me all 3 pine and the cryptomeria has fungal and beetle attack. By injecting shots (to kill fungus and beetles, these trees will recover. Though he said the pine with brown crown has 50% chance, seeing the crown still has some light green needles). I want to get your opinion if injecting shots can save these pine trees at this stage. I googled, many article says if the pine has been attacked by beetles, you must cut it down as it is not treatable. I would prefer to save, but do not want to spend $400 per tree for shots ($200 for beetle, $200 for fungus, and a 3 year treatment) if they are barely alive. Appreciate your expert opinion asap, as we need to urgently decide what to do (treat or cut down)! If we cut, can we plant another tree next to it (we can not grind the root as the trees are behind retainer wall so equipment can not get there).
Thank you!
Xijue
Multnomah County Oregon
