. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE ^ttBi^^tO^ In Cooperation with the North Dakota Agricultural Experiment Station DEPARTMENT BULLETIN No. 1120. Washington, D. C. PROFESSIONAL PAPER October 26, 1922 INVESTIGATIONS OF HEAT CANKER OF FLAX.^ By C. S. Reddy and W. E. Brentzel, Assistant Pathologists, Office of Cereal Inves- tigations, Bureau of Plant Industry. CONTENTS. Page. Introduction 1 Anthracnose canker 2 Heat canker of flax, a nonparasitic type 3 Cause of heat canker 3 Heat canker of flax, a nonparasitic type—
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE ^ttBi^^tO^ In Cooperation with the North Dakota Agricultural Experiment Station DEPARTMENT BULLETIN No. 1120. Washington, D. C. PROFESSIONAL PAPER October 26, 1922 INVESTIGATIONS OF HEAT CANKER OF FLAX.^ By C. S. Reddy and W. E. Brentzel, Assistant Pathologists, Office of Cereal Inves- tigations, Bureau of Plant Industry. CONTENTS. Page. Introduction 1 Anthracnose canker 2 Heat canker of flax, a nonparasitic type 3 Cause of heat canker 3 Heat canker of flax, a nonparasitic type— Continued. Preventive measures 15 Summary 16 Similar injury to other plants 14 • Literature cited 17 INTRODUCTION. The seed-flax area of the United States coincides closely with the spring-wheat region of the Northwest, composed for the most part of the States of Minnesota, the Dakotas, and Montana. Within this area flax wilt, drought, and Aveeds are the most important limiting factors in flax production. Flax mlt has gradually pushed the center of flax production westward into uninfested areas, while the newly broken prairie sod with its absence of weeds has led it in the same direction. When the production of flax reached this semiarid section, complaints came from the growers that the plants often broke over at or near the surface of the soil, as though whipped off by the winds or gnawed by insects. Fortunately for flax production. Prof. H. L. Bolley early became its advocate in North Dakota and devoted the greater part of his time to it for a number of years. He found the cause of flax wilt and developed control measures in the form of seed selection, seed treat- ment, and the development of resistant varieties (1, 2, 3, and 4-)-^ This has helped to eliminate losses from diseases caused by parasitic seed-borne organisms. Further work (4 and 6) explained the cause of one type of flax canker. As this disease was very destructive in I The investigations here reported have
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