NC State Extension Publications

Problem

Nutritional disorder – zinc (Zn) deficiency

Symptoms

Younger leaves initially develop a yellow interveinal chlorosis in the interior of the leaf, while the outside margin remains green. This produces a halo effect. Leaf blades are typically narrower and elongated. With severe deficiencies the interveinal areas can develop necrosis.

Fruit size is normal, but the number produces is less.

Initial zinc deficiency with green border and pale interior.

Initial zinc deficiency with green border and pale interior.

Brian E. Whipker

Initial zinc deficiency with green border and pale interior.

Initial zinc deficiency with green border and pale interior.

Brian E. Whipker

Similar Problems

Iron, manganese, and molybdenum deficiencies may produced similar symptoms.

Additional Information

Because symptoms can occur due to many possible causes, it is important to determine the actual cause. Tissue testing will help identify any nutritional disorders. Nutrient deficiencies usually take weeks to develop.

Diagnostic Tips

Take a soil sample to determine if nutrient levels are inadequate. Submit a leaf sample for nutrient analysis. The sufficiency range for zinc in strawberries is between 15 and 60 ppm. Some references recommend a narrower range of 20 to 40 ppm or 30 to 100 ppm. Values below 15 ppm are considered deficient and above 80 ppm are considered excessive.

Corrective Measures

Take a soil and tissue test to determine nutrient levels. Make adjustments based on those test results and the lab’s recommendations.

Management

Conduct a soil test prior to planting the crop to determine if pre-plant fertilizer applications are required. Fertilizer can also be injected to the crop during active growth. Recommendations vary by soil type and your location, so check with local resources for guidelines.

Funding Sources

Funding was provided in part by the National Sustainable Agriculture Program: Sustainable Strawberry Initiative and the following sources.

A thank you is also expressed to Kube Pak of Allentown, New Jersey for donating strawberry plants.

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Author:

Professor
Department of Horticulural Science

Publication date: April 24, 2014

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