Poor fruit set and stunted shots with small, misshapen leaves foliar application of zinc is the most effective method for treating Zn deficiency.

Neutral zinc products containing 50-52% Zn, or zinc oxide (75-805 Zn) are both effective as foliar sprays.  Zinc spray applications are most effective in improving fruit set when applied during the period of two weeks prior to bloom up to full bloom.  If foliar deficiency symptoms persist or reappear, a second application may be necessary.