Symptoms
- Boron deficiency causes both leaf and fruit symptoms.
- The main leaf symptoms are a distortion of newer leaves (in severe cases the growing point dies) and the appearance of a broad yellow border at the margins of the oldest leaves.
- Young fruit will die or abort at high rates.
- The symptoms of boron deficiency on mature fruit are distinctive and include stunted development and mottled yellow longitudinal streaks, which develop into corky markings (scurfing) along the skin.
- The proportion of pith to seed is often higher in boron-deficient fruit.
