I drove through the Blue Hill, Maine, last Fall and found the region to be very beautiful.
On the subject of borers, which is a new challenge in my case, I have observed that borers only seem to attack trees of a certain diameter. None of my trees of 1" in diameter and less are affected and none larger than let's say four inches. Maybe the larger tree's bark is too tough for the flat head borers to penetrate or the conditions under the bark are not favorable.
Did you notice also such preferences, or is it only accidental in my case?
The soft foam method that you described appear to serve the same purpose as the corrugated cardboard that I have described.
For myself, I find those methods to be too complicated, given the number of trees that I have to tend and the limited time that I have.
I am still inclined to cover the base of my trees with a lime and water type solution but to apply it earlier, at the beginning of August before the borer gets a chance to lay eggs for next year.
I have asked a friend who is very familiar with cement and stuccos substances to design a recipe for a solution that I could apply with a paint brush. It would consist basically of water, lime and/or white or regular cement and latex white paint. It would be applied thinly and would be solid but easily breakable, so that it would have to be reapplied yearly, but would prevent borers and other insects from being interested to lay eggs. It would also serve as a sunscreen over the winter. It is also very cheap and much easier and quicker.
I am definitely going to try it this year and I will keep you posted on the results.
Yesterday, I found another tree infested and this time the three borers had managed together to girdle the tree.
We shall overcome...
Thank you for your reply,
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