Pine tip moth is evidenced by brown tips that can easily be pulled off. The larva hollows out the stem and can often be found at the bottom of the hollow. If your two trees are 3-4', you can simply prune off the affected tips, making sure that you prune just beyond the hollow to make sure the critter is removed and destroyed. As for more growth this year, won't happen.
Here in KS they recommend spraying three times in areas where know infestations have occurred. Late April to early May, Late June to early July and late July to early August; but since you are a zone farther south, probably earlier for you on all three. Check with your extension service for timing.
hortster

I had minor issues with them in my Slash Pines for the past 3 yrs since planting. They "usually" put out new growth beside the affected area, depending on the time of the year... I have some now, very minor, but the trees are now around 13' tall and I can't get up there to really do anything anymore. I have 1 Loblolly and they haven't touched it so far, but it's very small... 3' or so. Good luck and your trees should be ok either way, but I would do what was recommended and break off the affected area... that's what I used to do when I could still reach those areas.

Are there any early warning signs that you have pine tip moth (or is browning of the new growth the frist sign?).

I don't have any issues but its always good to be know what to look for when doing walk throughs in the yard.

Thanks!

Hey! Thanks for all the responses. Just wanted to follow up and say that I removed the infected areas and did indeed get some regrowth on the pines. It's only about 6 to 8 inches, but I'll take what I can get.

Whaas, my understanding is that the best method is to spray for the moth larvae right as the trees are emerging in the spring. If you kill the larvae at that time, you should halt the moth development process and prevent tree damage. I'll try this next year, so I can tell you by experience then.