The larva in the photo is a cerambycid larva - it will grow up and become a longhorned beetle. It’s not possible to determine the species of these larvae but I’ll bet it’s a pine sawyer - probably Monochamous scutellatus but perhaps another Monochamous beetle. Pine sawyers tend to like to colonize white pine and M. scutellatus is the most common species here.

The large-ish exit holes in the bark were likely made by adult sawyer beetles emerging from the tree. The smaller exit holes were probably made by bark beetles. There will likely be larval galleries of both types of insects under the bark. Cerambycids start off feeding in the phloem (inner bark) but then move into the sapwood as they get larger. Bark beetles feed only in the phloem although the galleries of both types of insects will etch the outer sapwood.

In the first photo, it sort of looks like perhaps weevil larvae colonized the tree too but it’s hard to tell - I can’t tell the size of those galleries or what was in the little divots. If it was weevils, they would leave distinct chip cocoons under the bark. Weevils, and only weevils, pupate in chip cocoons. Northern pine weevil might colonize dying white pines - usually they get into logs laying on the ground tho. They leave round exit holes too - kind in between bark beetels and cerambycids. Without seeing the affected pine in person, its hard to tell how big the exit holes are.

At any rate, all of those insects and pretty much all the phloem-feeding and woodboring species that would colonize white pine in this region are secondary pests. They would only be attracted to and successfully colonize trees that are really really stressed, dying or have recently died or been felled. Drenching the live tree with an insecticide is not going to do much good. It would be much more effective to figure out why that white pine got so stressed and do what you can to avoid severe stress on the live tree. Usually, it’s a question of water - mostly not enough water. Road salt, compacted soil, etc. can all be stressors too. White pine is notoriously sensitive to herbicides (e.g., applied around or near the base of a tree) and even to air pollution.