PROPAGATION OF OTTAWA APPLE ROOTSTOCKS BY SOFTWOOD CUTTINGS

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Abstract
The difficulty in rooting Ottawa 3 apple (Malus sp. Mill.) rootstock by softwood cuttings under intermittent mist at other locations was not experienced at Saskatoon, Saskatchewan. With the exception of Ottawa 7, which would seem to be slower rooting than the rest of this rootstock series, namely, Ottawa 3, 5, 8, 11 and 12, high levels of rootability were obtained with 12.7-cm (5-inch) softwood cuttings under three types of intermittent mist propagation outdoors. The polyethylene tent over the intermittent mist bed was generally superior to the open intermittent bed with bottom heat and it, in turn, superior to the open intermittent mist bed without bottom heat. The use of hormone applications tended to speed up rooting and increased the yield of the root mass in the 7-wk period, but only in a few instances were there statistically significant differences.

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