Blueberry leaves issue, Help, curled up and burned
I have 6 dwarf blueberry trees in 30 Gallon Smart Pots (24"x 16.5"H ) in zone 9B-10 area.
Recently, I see some "curled" and "burned/ red" at the tip of the some leaves, and I'm not sure what cause it.
I've been watering the trees with some vinegar on regular basis and adding the liquid-Iron about every month. All other leaves seem ok, but it has few leaves like this on every plant.
Is this disease or some other issue?