TY - JOUR AU - Davis, L. D. TI - Black-end of pear: Problem is subject of extensive field and laboratory studies JF - California Agriculture JO - Calif Agr Y1 - 1948/06/01 VL - 2 IS - 6 SP - 10 EP - 15 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v002n06p10 AB - Intensive investigations have been conducted in the field and in the laboratory since about 1930 regarding black-end or hard-end condition of pears and the relation of the rootstock to the incidence of the disease.