Scope of the investigation 1 Review of the literature 2 Nursery experiments 4 Greenhouse experiments 14 Comparison of nursery and greenhouse results 23 Evidence of specific rust resistance.
Scope of the investigation l Review of the literature 2 Nursery experiments 4 Greenhouseexperiments 14 ■Comparison of nursery and greenhouseresults 23 Evidence of specific rust resistance 24 Agronomic value of Kanred wheat 26 Summary 27 Literature cited 30 SCOPE OF THE INVESTIGATION. A project to determine the rust resistance of existing varieties of winter wheats and to breed new varieties for rust resistance was begun in 1911 at the Kansas Agricultural Experiment Station, in cooperation with the Office of Cereal Investigations of the United States Department of Agriculture. The first two years were devoted to preparatory work, when no infection of stem rust was produced. The writers^took charge of the work in 1913, and the data given herein are those obtained since that time. The investigation outlined in 1913 had two major purposes: (1) To study the rust resistance of about 130 varieties and strains of winter and spring wheats, particularly to the stem rust, Puccinia graminis tritici Erikss. and Henn.,^in the field and in the greenhouse; and (2) to study the inheritance of rust resistance in wheat and to produce hybrids adapted to commercial use. 1Paper No. 183of the Department of Botany and Plant Pathology and No. 136of the Department of Agronomy, Kansas Agricultural Experiment Station. « The writers wish to acknowledgetheir indebtednessto Mr. Victor H. Florell and Mr. M. N. Levine, of the Office of Cereal Investigations, who assisted in the greenhousestudies and in other phases of the investigation. ' Puccinia graminis tritici, as used in this bulletin, has reference to those strains of stem rust used in the experiments in 1915,1916,and 1917. In 1915a strain was used to which Kanred, P1066,and P1068 were-only partially resistant, while in 1916and 1917strains were used to which these varieties were very resistant. The strains used in 1916and 1917may have been one or more^of the several strains which at present are known not to causenormal infection of thesevarieties.
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