Are my blueberries dead/dying?
I planted 6 blueberry plants 3 years ago. One day last week I noticed all the leaves had shriveled up and died on one plant, along with most of the flowers. Since we had a couple early 90 degree days, I thought it may have been lack of water. But now two others look very bad too. I didn't get any warning about this--no brown tips on leaves--so I'm wondering if I overfertilized? I added about 1/4 - 1/3 cup ammonium sulfate around each plant on May 9. The pics below show one healthy plant and the stems from one sickly one. They aren't great photos but hopefully someone can tell me what might be going on, and if there's anything I can do to save them. FYI the last soil test was done Oct 07 and ph was 4.9.