The most common issue with blueberries is a lack of vigour despite fertilising and regular watering. More often than not, this is due to a pH imbalance. Don’t fall for the idea that pine needles and coffee grounds can sufficiently lower pH. They help, but to get this down you really need to apply sulfur annually.
Birds love to snack on blueberries too, so you need to net your bushes when the fruit starts to colour up.
Blueberry rust ( Thekopsora minima) is a fungal disease that is present in all states where blueberries can be grown. It appears as pustules on the underside of foliage, which produce red lesions on the leaf surface. Spray with copper hydroxide in anticipation of warm, humid weather in spring.