Leaves are yellow: Yellowing is interveinal, not associated with browning
Interveinal yellowing is caused by iron deficiency, but is symptomatic of high soil pH. A high soil pH (>5.2) results in the inability of the blueberry plant to use iron, causing a lack of chlorophyll production.
Iron deficiency symptoms develop first in young leaves. Lowering the pH with sulfur will usually correct the problem.
More iron deficiency information.
More information:
- Iron deficiency – Michigan State University
- Lowering the Soil pH with Sulfur – Michigan State University
Suspected nutrient deficiencies can be verified with a soil and/or foliar analysis done through Agro-One.
Use these resources if you need additional help with diagnosis and to find solutions to your problem.