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The effects of silver thiosulfate (STS) on stored and freshly made cuttings of 'Royalty' rose (Rosa hybrids) were examined in relation to rooting and subsequent budbreak. STS pretreatment at 0.5 mM during storage stimulated budbreak but de- creased the percentage of cuttings that rooted and the number of roots. IBA at 4.9 to 9.8 mM inhibited budbreak but this effect was partially reversed by STS. Spraying the cuttings with 1.0 mM STS once daily during the first 5 days of the rooting period also reduced rooting but prevented IBA-induced leaf senescence. Ethephon and sperm- ine, each applied at 0.5 mM before rooting, had no effect on rooting or budbreak. Chemical names used: (2-chloroethyl)-phosphonic acid (ethephon); indole butyric acid (IBA); N,N'-bis(3-aminopropyl) -l,4-buanediamine (spermine).

Silver Thiosulfate Application Influences Rooting and Budbreak of `Royalty' Rose Cuttings