Water stress, both too much and too little. Prone to fluctuations in bearing. Bearing cycle may be biennial to several years. Appears to be a physiological response to heavy crop load, environmental stress and physical damage to reproductive organs. Pruning, especially the 'Y' training system, reduces fluctuation in yield.
Research activities None in California.
Rootstock development for increased drought, flood and soil adaption. References Growing Persimmons. Science Information Publishing Centre, Wellington, NZ Persimmon.