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Successful PP beetle eradication from lumber

Bill Tindall, E.Tn.
I cut and sawed into lumber a dead ash. It was infested with powder post beetles. For various reasons I wanted to recover the lumber.

It is claimed that the only way to be rid of them once established is by heat. I was optimistic a toxic vapor would kill them even within the wood, 4/4 and 8/4 ash in this case, their favorite food.

The surface of the sawed boards was thoroughly wet by spraying with a solution of borate and 1/4 cup malathion per gallon of water. The pile was then wrapped with plastic to contain the malathion vapor. After two days the plastic was removed and the lumber stacked on sticks to dry. The plastic had dozens of dead larva bodies that had crawled out of the lumber(looking for fresh air?).

After a year there has been no evidence of further boring activity.

I believe the toxic vapor penetrated the tunnels and entirely killed what was within. The borate has prevented further infestation.

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