TY - JOUR AU - Hield, H. Z. AU - Riehl, L. A. AU - Do Wolfe, T. A. TI - Isopropyl available for citrus: Registration of the isopropyl ester specifically for use as plant growth regulator on citrus permits this form of 2,4-D JF - California Agriculture JO - Calif Agr Y1 - 1956/08/01 VL - 10 IS - 8 SP - 6 EP - 15 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v010n08p6 AB - The value of 2,4-D and related substances for preventing mature citrus fruit drop, for increasing fruit size, and for amending oil spray used for pest control to prevent leaf drop or fruit drop—or both—has been demonstrated.