Citrus and Subtropical Crops
Mineral Nutrition Disorders

Boron deficiency

Boron deficiency in "Ruby Red' grapefruit is seen here as brown spots in the fruit rind. This causes a decrease in shelf life of the fruit, but may not be noticed by the grower except that they can appear "blistered" from the exterior..

Boron toxicity

Boron toxicity in citrus can be different than that seen in other plants. The leaf becomes mottled or chlorotic in the interveinal areas, like Mg deficiency. Advanced stages are characterized by large areas of chlorotic leaves and veins.

Boron toxicity

Boron toxicity in citrus can be similar to that seen in other plants. The leaf becomes mottled with necrotic spots in the interveinal areas. Advanced stages are characterized by large areas of necrosis.

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