Small Dry Twigs Falling From My Two America Basswood Lindens

Question

They have done this for 28 years and appear very healthy. Had them trimmed in early March and the dropping are much heavier this year.

Answer 1

It could be tree borers. Lindens are very susceptible. Here is more:

https://www.gardeningknowhow.com/ornamental/trees/linden/linden-borer-control.htm
https://www.gardeningknowhow.com/ornamental/trees/linden/linden-tree-information.htm