Abstract
Abstract The no. of flower buds on ‘Gibraltar’ Exbury azaleas (Rhododendron spp.) was increased by single sprays of succinic acid-2,2-dimethylhydrazide (SADH) at 7,500 to 20,000 ppm, 1-propyl phosphonic acid (PPA) at 1000 ppm, 5-chloro, 2-thenyl, tri-n-butyl-phosphoniumchloride (CTBP) at 1000 and 3000 ppm, and α-cyclopropyl -α-(methoxy-phenyl)-5-pyrimidinemethanol (ancymidol) at 250 and 500 ppm. Applications in July reduced plant ht. Early August applications of SADH had less effect on no. of flower buds than early July applications and did not reduce plant ht. Double sprays of (2-chloroethyl) trimethyl ammonium chloride (chlormequat) at 2000 and 4000 ppm did not affect ht or no. of flower buds. A soil drench of 2,4-dichlorobenzyl-tributylphosphonium chloride (CBBP) at 0.5 or 1.0 g per plant increased the no. of flower buds on ‘Cecile’ and ‘Renne’ Exbury azaleas.
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