Use of plant growth regulators to control flowering in citrus

With the aim to increase citrus fllowering under tropical conditions, two formulations of 2-chloroethyl phosphonic acid (Ethrel and Flordimex), Alar (succinic acid-2, 2-dimethyl hydrazide) and Cycocel (2-chloroethyl-trimethyl ammonium chloride) were applied during the flower induction period (December) to young “Valencia” orange trees at concentrations of 1000, 2500 and 5000 mg l⁻¹. These treatments effectively increased flowering, mainly at lower concentrations. Treatment using Flordimex at 500 and 1000 mg l⁻¹ concentrations resulted in flowering increase which is analyzed in this paper. Presented at the International Symposium “Plant Growth Regulators” held on June 18–22, 1984 at Liblice, Czechoslovakia.