Abstract
Grafted ramets, full-sib families, and open-pollinated families were derived from two healthy and one western gall rust (Endocronartiumharknessii (J. P. Moore) Y. Hiratsuka) infected Scots pine (Pinussylvestris L.) and inoculated with western gall rust. Resistance appeared to be a qualitative character; grafts and seedlings either had many infected shoots or none. All F1 families for which the diseased tree was one of the parents were about 50% infected. All other full-sib families showed <15% infection. There was no distinction between bulk inoculum collections from Scots and from lodgepole (Pinuscontorta Dougl.) pine. It is proposed that susceptibility to western isolates of the gall rust in the Scots pine trees tested in this experiment is conditioned by a dominant gene.
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