Do my highbush blueberries have a fungal disease?

Question: I have several blueberry bushes that are developing reddish/purple leaves and berries throughout the summer. This affected the berry bushes last year as well. I am struggling to diagnose the cause and come up with a remedy so I’m hoping to get some guidance. I have had some suspicion of fungal disease and have read more Do my highbush blueberries have a fungal disease?