I have some blueberry bushes I started awhile back and for awhile they looked VERY healthy. Then I moved them next to the home so they would have afternoon shade now that the temperature has gone over 110 here and within a week they developed some brown or reddish spots on the leaves.
Does anyone know what might be causing this and is there a way to cure / prevent it?
The blueberries are planted in 12" containers wit ~50% Sphagnum Peat Moss, and 35% Forest Hummus with a little Perllite, Vermiculite and coffee grounds. The soil PH comes in at 5.3 or so.
Everything I have found for a treatment is pull and burn them. I'm concerned since that doesn't help prevent the next occurrence and possibly it is curable. If the severe treatment is needed should I discard the soil as well or compost it / reuse it?