Blueberry leaves turning yellow to almost white
New shoots of my Austin blueberry are turning from yellow to almost white. Is it Iron Deficiency due to high pH or is it over watering stress, or insufficient nitrogen? Texas temperature has hit above 90F and I have been watering (rain water) everyday. This plant is in a well container having 50:50 peat moss and pine bark mulch. My other blueberry plants do not have this problem, all of them are fertilized with ammonium sulfate as fruitnut and other advised. Any suggestion, advice from blueberry experts will be highly appreciated.