. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. UNITED STATES DEPARTMENT OP AGRICULTURE BULLETIN No. 842 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief PROFESSIONAL PAPER September 7,1920 THE NEMATODE DI CAUSED BY EASE OF WHEAT HUS TRITICI By L. P. BYARS, formerly Pathologist, Office ©f Cotton, Truck, and Forage Crop Disease Investigations, in cooperation with the Office of Cereal Investigations CONTENTS Occurrence of the Disease 1 History 2 Distribution 4 Economic Importance 6 Description of the Disease 6 Differences between
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. UNITED STATES DEPARTMENT OP AGRICULTURE BULLETIN No. 842 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief PROFESSIONAL PAPER September 7,1920 THE NEMATODE DI CAUSED BY EASE OF WHEAT HUS TRITICI By L. P. BYARS, formerly Pathologist, Office ©f Cotton, Truck, and Forage Crop Disease Investigations, in cooperation with the Office of Cereal Investigations CONTENTS Occurrence of the Disease 1 History 2 Distribution 4 Economic Importance 6 Description of the Disease 6 Differences between This Disease and Tulip-Root 8 Origin and Description of the Galls . 9 Cause of the Disease 10 Page Effect of High Temperatures on the Larva; - 19 Effect of Chemicals on the Larvae. . 24 Overwintering of the Parasites ... 27 Host Plants 28 Methods of Spreading the Parasites . 30 Methods of Control 32 Summary 35 Literature Cited 37. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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