10 THE CONTEOL OF COTTON WILT AND ROOT-KNOT. 



will be of interest to all concerned. The Office of Cotton and Truck 

 Disease lias been engaged in the scientific questions involved — the 

 study of the nature and cause of wilt, its control, the breeding of re- 

 sistant varieties, the nature of disease resistance, etc. The patho- 

 logical problems have been nearly solved. Tliis office is now working 

 on the relationsliip and parasitism of the wilt fungi. The breeding 

 problems are also well on the way to solution. There remain to be 

 completed studies on the inheritance of disease resistance and a new 

 line of breeding made necessary by the eastward migration of the 

 boll weevil, namely, the production of wilt-resistant varieties that 

 arc early, large boUed, and adapted to boll- weevil conditions. Tliis 

 work has been under way for four years. It has given results of 

 promise and will be carried on to completion. 



The part of this office in the cooperative work will be to outline 

 methods of control, provide stocks of the resistant varieties bred, 

 and furnish all needed aid and information to the other workers. 

 The work will be done through its representatives in the field who 

 are at the same time the employees of the South Carolina Agricultural 

 Experiment Station and the Georgia State Board of Entomology. 

 The work in Washington is in charge of IMr. W. A. Orton, assisted 

 by Mr. W. W. Gilbert. The office is represented in South Carolina 

 by Prof. H. W. Barre, of Clemson College, assisted by Mr. L. O. 

 Watson, and in Georgia by Mr. E. L. Worsham and Mr. A. C. Lewis, 

 of the State Board of Entomology at Atlanta. 



The Farmers' Cooperative Demonstration Work, in charge of Mr. 

 Bradford Knapp, has for its general object the improvement of 

 agricultural methods and conditions in the regions invaded or about 

 to be invaded by the boll weevil. It has built up for this purpose 

 a large organization, reaching from State agents through county and 

 local agents to thousands of farmers who are trying new methods. It 

 is through these agents and demonstrators and through the extension 

 department of the States that the men on the farm can be helped 

 most directly. The part taken by this office in the cooperation con- 

 sists in the dissemination of information, in bringing effective rota- 

 tions for the control of root-knot into general practice through 

 demonstrations by farmers, and in the introduction and trial of wilt- 

 resistant varieties of cotton and cowpeas. 



The agents of the Farmers' Cooperative Demonstration Work will 

 meet the pathologists as frequently as possible and secure their help 

 in identifying plant diseases and their advice regarding methods 

 of control. 



The officers of the experiment station in South Carolina xmd the 

 Board of Entomology in Georgia cooperate in this campaign in several 

 ways. Their pathologists are the official representatives of the Bureau 

 of Plant Industry to the end that the efforts of all workers may be 

 united and duplication of effort and expense avoided. 



[Cir. 92] 



