Boron

Deficiency Symptoms

Short leaf petioles with dark green rings.  Excessive sheding of buds and young bolls.  Ruptured nectarines, small bolls, and delayed maturity.  Terminal bud dies, more lateral branches with short internodes.  Black discolouration at the base of bolls.  Bolls dry and fall young leaves become thick, brittle with water spots.

Soil application of borax 0.5 kg/ha or foliar spray of borax 0.2