Boron Deficiency in Wattle
Symptoms of boron deficiency usually first appear on two-year-old trees during the dry season. The first signs are leaf chlorosis, cambial necrosis, and the drying and death of the growing point on the main shoot. The branches also die back. Defoliation and death then spreads steadily downward and inward from the apical growing points. If the rains start before the tree is dead there may be a partial recovery, but further attacks can be expected in subsequent dry seasons, and ultimately the trees die.