Abstract
Substituted oxathiin (P-293), in concentrations of 0.125 to 0.75%, was used for control of side shoot development of chrysanthemum (Chrysanthemum morifolium) cv. Golden Shoesmith, Fred Shoesmith, Promenade, Impr. Indianapolis White, Festival, and Wildfire. Chemical sprays applied on 20th or 23rd day of short-day period decreased the number of side shoots, delayed flowering up to 4 days and also damaged the leaves of cv. Golden Shoesmith and Fred Shoesmith. The smallest number of side shoots and the largest blooms developed on the other four cultivars when the chemical was used at a concentration of 0.50% a.i. on the 20th short-day. The chemically treated plants, without any manual disbudding, had blooms smaller in size and weight than those from the nontreated, disbudded controls. Plants which were disbudded once by hand 2 wk after the chemical treatment produced somewhat larger and heavier blooms than the plants of the nontreated, disbudded controls. The results indicate that the chemical used on certain cultivars of chrysanthemum may reduce the manual disbudding time without reducing the size and weight of the blooms.
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