Blueberries

Question

Why are the leaves turning yellow with dark green veins in them? How do I correct it?

Answer 1

If the ph is to high in the soil your plant can suffer chlorosis, an iron deficiency.
These articles will help you.

https://www.gardeningknowhow.com/edible/fruits/blueberries/lower-soil-ph-blueberries.htm
https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm
https://extension.umd.edu/growit/iron-chlorosis-blueberries