. Department bulletin. Agriculture; Agriculture. Washington, D. C. PROFESSIONAL PAPER. March 22, 1923 SYMPTOMS OF WHEAT ROSETTE COMPARED WITH THOSE PRODUCED BY CERTAIN By Harold H. McKinney, Assistant Pathologist, Office of Cereal Investigations., Bureau of Plant Industry, and Walter H. Larrimer, Scientific Assistant^ Office of Cereal and Forage Insect Investigations, Bureau of Entomology. CONTENTS. Page. Introduction 1 Symptoms of wheat rosette 2 Symptoms produced by the Hessian Comparison between the symptoms fly 4 of wheat rosette and those caused by the Hessian fly ' 5 Symptoms p
. Department bulletin. Agriculture; Agriculture. Washington, D. C. PROFESSIONAL PAPER. March 22, 1923 SYMPTOMS OF WHEAT ROSETTE COMPARED WITH THOSE PRODUCED BY CERTAIN By Harold H. McKinney, Assistant Pathologist, Office of Cereal Investigations., Bureau of Plant Industry, and Walter H. Larrimer, Scientific Assistant^ Office of Cereal and Forage Insect Investigations, Bureau of Entomology. CONTENTS. Page. Introduction 1 Symptoms of wheat rosette 2 Symptoms produced by the Hessian Comparison between the symptoms fly 4 of wheat rosette and those caused by the Hessian fly ' 5 Symptoms produced by the wheat strawworm 6 Page. Comparison between the symptoms of wheat rosette and those caused by the wheat strawworm Symptoms caused by the wheat stem maggot Comparison between the symptoms of wheat rosette and those caused by the wheat stem maggot Conclusions Literature cited INTRODUCTION. Shortly after wheat rosette was brought to the attention of plant pathologists, certain workers advanced the idea that the disease was due to an infestation of the Hessian fly (Phytophaga destructor Say) on account of certain characters manifested by the diseased plants which resemble those of plants infested with the larvss or puparia of this insect. Although this view was not held by entomolo- gists who were familiar with the situation, it was considered desirable that the latter group of workers should cooperate in the investiga- tions in order that the possibilities of an insect cause might not be overlooked. The writers have made observations and conducted experiments with wheat rosstte and also with a number of maladies of wheat caused by insects which in certain stages of their development might be confused with wheat rosette. During 1920-21 careful observations were made on wheat plants growing in soil infested with the causal agent of wheat rosette. Three plats of Harvest Queen (white-chaffed Red Cross) wheat were sown at intervals during the fall. These plats were 5 feet
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