UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 1038 



Contribution from the Bureau of Plant Industry 

 WM. A. TAYLOR. Chief 



Washington, D. C. ▼ March 20, 1922 



PECAN ROSETTE 



ITS HISTOLOGY, CYTOLOGY, AND RELATION 

 TO OTHER CHLOROTIC DISEASES 



By 



FREDERICK V. RAND 



Pathologist, Laboratory of Plant Pathology 



CONTENTS 



Types of Chlorotic Plant Diseases .... 1 Studies of Pecan Rosette — Continued. 



Chloroses Due to Soil or Atmospheric Histological and Cjiiological Studies . 19 



Conditions 2 Subsidiary Experiments 30 



Infectious Chloroses 6, Probable Nature of Pecan Rosette .... 31 



Studies of Pecan Rosette 13 Summary 36 



Results of Previous Work 13 Literature Cited 37 



External Signs of Rosette ...... 17 



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WASHINGTON 

 GOVERNMENT FBtNTING OFFICE 



1922 



