Foam Sprays of Plant Growth Regulating Chemicals on Rose Shoot Development at Cutback1

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Abstract
Expanded foam sprays of (2-chloroethyl)phosphonic acid (ethephon), 6-(benzylamino)-9-(2-tetrahydropyran-yl)-9H-purine (PBA), and 6-benzylamino purine (BA) at 1000 and 2000 ppm applied at plant cutback increased the total number of flowering stems per plant and the number of stems from axillary buds within 30 cm of the bud union, compared with conventional sprays of the same chemicals and concentration. Sprays of plant growth regulators were most effective when applied at cutback, with less benefit from treatments 3 weeks before cutback or 1 or 3 weeks after cutback. No chemical or method of application effectively promoted shoot development from the bud union.

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