Hi,

The answer to your questions is "Yes" for both.

Many pecans in the Austin area sustained damage from the February freeze. Wood boring insects will take advantage of this, especially if they are already present. Here are two good references for growing pecans:

https://citybugs.tamu.edu/files/2018/08/Pecan-Pests-in-the-Home-Orchard-ENTO-083.pdf

https://aggie-horticulture.tamu.edu/fruit-nut/files/2015/04/pecans_native_2015.pdf

There is not a lot you can do to prevent wood-boring insects, other than maintain good sanitation and trying to prune out dead wood.

Regarding the excessive growth - this is a normal response for the tree. It needs photosynthesis to produce the energy needed to repair itself, and the only way to do that is to push out a lot of leaves. You can thin the new sprouts this summer. Choose the most vigorous ones as "winners" and remove the smaller sprouts. Try not to remove more than 1/3 of the new sprouts because the tree will self-prune whenever a good wind blows through, and you can expect some limb drop again next year.

Thanks,