. Bulletin of the Department of Agriculture. Agriculture; Agriculture. i BULLETIN No. 629 & Contribution from the Bureau of Plant Industry •; WM. A. TAYLOR, Chief JO&*^&U. Washington, D. C. PROFESSIONAL PAPER February 11, 1918 GREENHOUSE EXPERIMENTS ON THE RUST RESISTANCE OF OAT By John H. Parker, formerly Scientific Assistant, Office of Cereal Investigations. CONTENTS. Page. Introduction 1 The culture of cereal rusts in the green- house 2 Experimental methods 2 Sources of material 5 Page. Evidences of rust resistance in cereals 5 Experimental data 8 Discussion of
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. i BULLETIN No. 629 & Contribution from the Bureau of Plant Industry •; WM. A. TAYLOR, Chief JO&*^&U. Washington, D. C. PROFESSIONAL PAPER February 11, 1918 GREENHOUSE EXPERIMENTS ON THE RUST RESISTANCE OF OAT By John H. Parker, formerly Scientific Assistant, Office of Cereal Investigations. CONTENTS. Page. Introduction 1 The culture of cereal rusts in the green- house 2 Experimental methods 2 Sources of material 5 Page. Evidences of rust resistance in cereals 5 Experimental data 8 Discussion of results 13 Summary and conclusions 14 Literature cited 16 INTRODUCTION. The rusts have long been recognized as one of the most serious limiting factors in the production of wheat and oats, both in the United States and in other countries. Considerable work has been done on the problem of controlling rust in wheat through resistant varieties and some results have been published, but very little specific information has been made available on the rust resistance of oat varieties in the United States. The importance of the oat crop among the small grains in the United States is second only to that of wheat, and the problem of rust control is perhaps even more acute, for oats are more widely grown in localities favorable to rusts. For this reason a proper choice of varieties, based on accurate experimental tests, is a neces- sary factor in successful oat culture. The present paper presents the results obtained in greenhouse culture work with the crown rust of oats, Puccinia lolii avenue McAlpine (PL I, fig. 2, and PL II), and 1 The work here described was a part of the graduate studies of the writer during the college year 1915—16 at Cornell University and was a continuation of investigations conducted for several years while in the United States Department of Agriculture. The departments of plant breeding and plant pathology in the university provided every facility for the wo
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