PECAN ROSETTE 



By W. A. OrTON, Pathologist in Charge, Cotton and Truck Disease and Sugar-Plant 

 Investigations, and Frederick V. Rand,' Assistant Pathologist, Laboratory oj Plant 

 Pathology, Bureau of Plant Industry 



HISTORY AND DISTRIBUTION 



Rosette has been rather generally recognized by growers as a serious 

 disease almost from the inception of commercial pecan orcharding. 

 As early as 1902 requests came to the United States Department of 

 Agriculture for an investigation into the causes of the disease and possible 

 methods of control. The work was at once undertaken by the senior 

 author and carried on for about four years in connection with other 



Fic. I. — Map showing the known distribution of pecan rosette in the United States. 



work in the Southern States, but between 1906 and 1910 little attention 

 was paid to the disease. Since 1910, and more particularly during the 

 seasons of 191 2 and 191 3, the experimentation has been continued by 

 the junior author. 



The disease is well distributed over the pecan-growing territory from 

 Texas to the Atlantic coast and from Florida to Virginia. (See fig. i.) 

 It has been definitely seen by one or the other of the authors at Whittier, 

 Cal. ; San Antonio, Boerne, Waring, Kerrville, San Saba, Waco, Austin, 

 McKinney, Tex.; New Orleans, La.; Ocean Springs, Miss.; Atlanta, 



* The work of the junior author was carried out while he was employed as scientific assistant in the O ffice 

 of Fruit-Disease Investigations, Bureau of Plant Industry. 



Journal of Agricultural Research, 

 Dept. of Agriculture, Washington, D. C. 



(149) 



Vol. Ill, No. 1 

 Nov. 16. 1914 

 G— 36 



