Pine beetles

Cut a perimeter 2x height around infected trees showing pitch tubes/sawdust or yellowing needles.

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cut and burn all the infested trees.

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I remember the neighborhood I lived in as a child had a run of those.
When we moved in, there were pine trees everywhere.
Those beetles took out a path 50 yards wide straight through the neighborhood.
Streets in the front and back of the neighborhood still have pine trees.
2 blocks of streets in the middle have zero pine trees.

Every pine tree that has been infested on my 2 acres died. Look for browning needles. I don't hear so well anymore but my wife could hear them chewing their way up the tree. I've lost at least a dozen large pines.

My neighbor lost over 30 during the last big drought and luckily I didn't lose any big trees.