NC State Extension Publications

Problem

Nutritional disorder – manganese (Mn) deficiency

Symptoms

Younger leaves initially develop a yellow coloration. Leaves can also develop a fine netted appearance between the veins, which over time become more pronounced. With severe deficiencies the interveinal areas can develop necrosis.

Fruit size is also smaller.

Initial symptom of Mn deficiency on the young leaves.

Initial symptom of Mn deficiency on the young leaves.

Brian E. Whipker

Initial symptom of Mn deficiency on the young leaves.

Initial symptom of Mn deficiency on the young leaves.

Brian E. Whipker

Initial symptom of Mn deficiency on the young leaves.

Initial symptom of Mn deficiency on the young leaves.

Brian E. Whipker

Intermediate Mn deficiency symptoms.

Intermediate Mn deficiency symptoms.

Brian E. Whipker

Intermediate Mn deficiency symptoms.

Intermediate Mn deficiency symptoms.

Brian E. Whipker

Necrotic spots with advanced manganese deficiency symptoms.

Necrotic spots with advanced Mn deficiency symptoms.

Brian E. Whipker

Similar Problems

Iron, sulfur, 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 manganese in strawberries is between 30 and 300 ppm. Some references recommend a narrower range of 50 to 200 ppm or 30 to 100 ppm. Values below 25 to 35 ppm are considered deficient and above 350 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.

University of Arkansas logo

Walmart Foundation logo

Author

Professor
Department of Horticulural Science

Publication date: April 24, 2014

North Carolina State University and North Carolina A&T State University commit themselves to positive action to secure equal opportunity regardless of race, color, creed, national origin, religion, sex, age, veteran status or disability. In addition, the two Universities welcome all persons without regard to sexual orientation.