Look for patterns in the field to help distinguish between excessive fertilizers, herbicide injury, or nutrient deficiency.

1) excessive fertilizer - rather uniform pattern of injury, appearing suddenly

- when ammonium fertilizers are applied just prior to wet, warm weather

- excessive chloride fertilizers

- excessive boron

2) herbicides - regular patterns in the field, such as the ends of rows where the sprayer turned or every fourth row where spray overlap occurred, etc.

3) nutrient deficiencies, such as potassium, magnesium or calcium - tend to follow soil type or drainage patterns

calcium deficiency	calcium deficiency	magnesium deficiency

potassium deficiency causes marginal burning and a dark discoloration of the leaves

Back to Leaf and Stems - colors

Back to Strawberry Diagnostic Tool

This is a part of The Berry Diagnostic Tool - a companion to the NRAES Production Guides for Strawberries, Raspberries and Blueberries