Heavy redspots on Potted Blueberry
Almost all of the leaves of two of my blueberries Climax and Brightwell have heavy red/purple spots on the front side and the backside is completely turned red/purple.
These were bought from Home Depot in April and I noticed the red spots last week when I got back after out of country for 4 weeks. I water them using harvested rain water but in between tap water was used when I was out of country. I'm not sure of the soil pH, just ordered pH testing kit. Also I noticed spider mites in both the blueberry plants.
Attached picture has both front and backside of the leaves.