The bushes are planted pretty close to each other and they have a tree to deal with. To me it appears quite clearly to be nitrogen starved, in fact all 3 are starved. The reason the other two are not as light could simply be the difference in plant type or more likely it is due to that plant being in the middle so it has competition on both sides for nutrients. A good sign the plants are getting all the energy they need is large dark green leaves and new....I call them bull shoots coming from the base of the plant. You can see one nice size new shoot on the plant on the right but that is it. On young plants you want to see 2 per plant minimum and they should be pencil thick. I would strongly suggest you get some water soluble ammonium SULFATE not ammonium nitrate. Use 1 tsp per gallon of water and do that weekly giving 2 gallons per plant. Make sure the plants are not dry when you give it. The plant should green up pretty fast. The ammonium sulfate is 21-0-0. For those that say what about the other needed elements? Ignore them for now. The BB need the nitrogen constantly but only need the P and K now and then, same goes for all plants. For inground plants that are mulched there is generally enough native P and K anyway. I have not given my 200 or so in ground BB any P or K yet this year just nitrogen weekly since mid February. Potted plants are different and need more P and K added more often. One of the problems with our "soil" is fertilizer tends to wash right through. Ammonium sulfate clings tightly to the soil and resists being washed out. Here is a picture of what you want your leaves to look like. This is on one of my bushes. While those leaves may look big last year Floralcity Lou had leaves on his potted plants that were even bigger. This year I have him beat :) as he was overrun with new projects. Bet that is more than you wanted to know lol.

Pug, As Tradition said wrong stuff. Some people do use aluminum sulfate but i would NEVER use it on anything. Not to pry but what town are you in? JcSherman, I would use the rate Fruitnut suggested. He knows his stuff and is very knowledgeable on growing in pots....what was the dosage.... 2.5 tsp per 5 gallons? The tsp per gallon can be used in pots as long as enough water is run through the pot between feedings but why chance it? Perhaps use the 1 tsp per gallon rate the first time then use the reduced rate after that. The tsp per gallon rate won't hurt them put if you do it week after week it could.

Some of my blueberry plants are showing the same simptoms too. They used to be in 17 gallons pots then I transplanted them in to raised beads in March. A part from the drying/dying new berrie formation, the bushes are looking fine otherwise. I did notice a large number of aphids this year . Last winter was vey mild while this Spring was very cold with a few late frost. In my case I thought that the combination of transplant, pests and weird weather caused the issue.

I agree with Wayne. I would also recommend much more mulch, something acidic like pine needles is ideal. Blueberries have very shallow root systems, so mulch helps regulate the moisture retention. A soaker hose can be an easy way to be sure it stays well-watered too.