EXPRESSION OF LEAF RUST RESISTANCE IN SELKIRK AND EXCHANGE WHEATS AT DIFFERENT STAGES OF PLANT DEVELOPMENT

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Abstract
Unexpectedly heavy leaf rust development was observed on mature (ripe) field-grown plants of the resistant wheat varieties, Selkirk and Exchange. Greenhouse experiments with pure races of leaf rust showed that a partial breakdown of both seedling and adult plant resistance occurred when the plants were approaching maturity. This change in resistance would not affect yields but could result in exaggerated estimates of rust damage. Leaf rust readings in rust nurseries, at least on these varieties, should be made before the plants are ripe.