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
California Agriculture 10(8):6-15.
Published August 01, 1956
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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.