How to Manage Pests

Pests in Gardens and Landscapes

Nitrogen and phosphorus deficiencies

Leaves of plants deficient in nitrogen turn uniformly yellow or reddish orange. Older leaves are affected first. Petioles may turn reddish. Deficiency of phosphorus causes older leaves to turn dark green. Upper leaf surfaces develop a shiny, metallic appearance, lower surfaces become purplish, and leaf veins appear blue.

Solutions

Nutrient deficiencies rarely occur in strawberries as long as recommended cultural practices are followed. Avoid nutrient deficiencies by providing adequate fertilizer. If you apply fertilizer during the season, be sure to use only the minimum amounts needed to avoid potentially harmful accumulations of salt.

Nitrogen deficiency
Nitrogen deficiency
Lower leaf surface deficient in phosphorus
Lower leaf surface deficient in phosphorus


Statewide IPM Program, Agriculture and Natural Resources, University of California
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