TRIALS WITH ETHEPHON AND OTHER GROWTH RETARDANTS ON POTTED CHRYSANTHEMUMS
In two successive trials carried out during the winter-spring period of 1971–1972 and spring-summer period of 1972, the dwarfing activities of certain growth regulators used on "Bright Golden Anne" potted chrysanthemum cultivars were examined. The results showed a better response to dimethazide, which was less influenced than other chemicals by the evironmental differences of the two trials. Dimethazide sprayed as its commercial formulation B-Nine, supplied results which were preferable to those obtained with its other formulation Alar. Ethephon spraying at 320 ppm gave good results, but in the first trial it excessively delayed flowering. Phosfon at 6 g/m3 and 9 g/m3 under the conditions of the trials induced excessive dwarfing activity, small flowers and delay in flowering. The treatments with Pydanon 20 caused less dwarfing than the other chemicals, but we deem it advisable to repeat the trial with this product at higher dosages.
Pergola, G. (1974). TRIALS WITH ETHEPHON AND OTHER GROWTH RETARDANTS ON POTTED CHRYSANTHEMUMS. Acta Hortic. 43, 381-392