Red spots are on the upper leaf surface only
Red spots are on both the upper and lower leaf surfaces
Note: Blueberries develop a maroon color in autumn, but this is normal. They also can develop a reddish-purplish hue in spring if the weather is cold. This coloration disappears during warm weather.
Back to Blueberry Diagnostic Tool
This is a part of The Berry Diagnostic Tool - a companion to the NRAES Production Guides for Strawberries, Raspberries and Blueberries