Sorry to say but it looks like spider mites to me. I can't be absolutely sure because when I blow up the photo it gets quite fuzzy and they are hard to see even up close and personal. But the damage sure looks like them - even some webing.

Check out the link below for more details and discussions on them and control suggestions.

Good luck.

Dave

Here is a link that might be useful: Spider mite discussions

Dave, thanks so much. The more I researched/thought about it the more that's what I thought it might be. But, the leaves haven't turned yellow at all, just shriveled on the top part of the plant.

I'm also a little confused as I research if I can save my plants with Safer soap or if I should pull them up. My Brandywine has the same leaf damage, only not nearly as much. The other leaves look just great. How do I know when they're too far gone? Should I prune the bad leaves off?

The best way to check if it is red spider mite or not, is to get yourself a largish magnifying glass, and examine the leaves through that, often you will see telltale very fine spun webs beginning to form across the tips like fine silken threads, but apart from that if you can manage to turn one or two leaves over and look at the underside you will see thousands of little pin holes through the leaf,if it is red spider mite.

If it is not red spider, then some other course of action will have to be taken, usually with red spider the leaves at the tip of the plant tend to look shriveled and deformed too.

The best way to tackle them is to spray underneath the leaves with Derris or by another name Rotenone, which is harmless to veg of all kinds and pretty safe to use, this will kill them off quickly, spray again in three weeks time to catch any newly hatched eggs etc.