Failure to set seed; internal breakdown of fruit or vegetable; death of apicalbuds, giving rise to witches broom; failure of root tip to elongate normally;young leaves become thick, leathery, and chlorotic; rust colored cracks andcorking on young stems, petioles and flower stalks (e.g. heart rot of beets, stemcrack of celery); breakdown occurs at the base of the youngest shoots)

Boron deficiency causes yellowing or chlorosis of youngest leaves and stems which starts from the base to the tip. Resetting of terminal shoots of potato.

Leaf tip burn, elongate and become whitish brown in rice. Death of terminal budoccurs in extreme cases. Boron deficiency causes brown heart in radish andcrown choking in coconut.

Excess can cause tips and edges of leaves exhibit necrotic spots coalescinginto a marginal scorch (similiar to high soluable salts); oldest leaves areaffected first; plants are easily damaged by excess application