By way of an update, I initially began exploring the symptoms of fungal diseases such as cedar apple rust, apple scab, alternaria leaf spot, and entomosporium leaf spot. However, none of the photos I could find of these infections exactly matched the leaf spots on my trees.

Yesterday I checked the trees again and found that the brown spots appeared to be forming raised areas on the leaves. In an effort to identify what was going on, I broke one of the small brown "pockets" open and found a larvae inside, about 1/4" long. I opened several of the other raised areas on the leaf spots and found a larvae in each. Any idea what insect these could belong to?

I planted some bare root stone fruit trees in containers,earlier this year.It's been getting hot here on some days.Some of the trees leaf tips look like the ones in your photos.Mine may be doing it because of the inability of the root system to adequately provide enough water to the plant,during the hottest days.I'm not really concerned,because overall,they are growing and looking good. Brady

Wolfridgeil - I too thought it odd that the damage started primarily at the leaf tip. My suspicions right now are either the Spotted Tentiform Leafminer or the Apple Leafminer, but I'm still not sure I have a positive ID. The damaged leaves visible in the second link you provided look very similar to the leaves on my trees, although the larvae were much, much smaller than the caterpillar pictured.

In an effort to rid the trees of the problem, I took the time to pinch each "tent" that had formed, with the intent of killing whatever larvae resided within. Barring a second generation of the pest, this should rid my trees of the problem for this year. Interestingly, it primarily affected only two of the six apples trees.

Bradybb - If you have fruit trees that are displaying similar symptoms, be sure that small "tents" aren't forming on the leaves. If they are, I encourage you to open one up to see what you find.

Any chance it is the Apple Leafcurling Midge?

http://www.tfrec.wsu.edu/pages/opm/ALM

The small larvae of the Midges look a lot like the ones I found on my two apple trees, but none of my leaves exhibited the leaf curling illustrated in the photos available at the above link. That's a pest I hadn't yet heard of though.