[Pete from Shawnee Mission]

Thank you, happy to share it!

"The point is that the beetles are propagating without nematodes while the nematodes can't propagate without beetles to eat."

I would need more knowledge of entomology and the ecology of pine forests to respond. I know that the labs that produce them feed them on meal worms. They do not feed exclusively on pine borer grubs so this may not necessarily be true provided there is something else to eat somewhere on the tree (Pine sawyer larvae?).

"Mathematically that means they cannot eradicate but can only control a population."

In a true wilderness setting this might not be an issue. Some trees may die, and insect and woodpecker damage is tolerated. Hard to say how it would work for forestry purposes. It might be interesting to do a search and see if there have been any field trials of PN in large tracts of loggable timber.

(I wonder if BT would work on these grubs? Well, maybe for another thread...)

[Carry_Okie]

It might be interesting to do a search and see if there have been any field trials of PN in large tracts of loggable timber.

I did. I didn't find much that wasn't mixed in with a lot of other unrelated material.