CROP ROTATION SYSTEM ADAPTED TO SECTIONS INFESTED 



WITH TOBACCO WILT 



By 



E. G. Moss,* Assistant Director of Tobacco Station, 



and 

 Frederick A. Wolf, Plant Pathologist, North Carolina Agricultural 



Experiment Station. 



For a number of years, growers of tobacco have annually suffered 

 more or less serious losses from a disease commonly known as tobacco 

 wilt. The studies which have been made to determine a satisfactory 

 means of control of this disease have demonstrated that none of the 

 native or foreign varieties of tobacco or any strains secured by crossing 

 them possess any marked resistance to the disease. These studies have 

 furthermore demonstrated that the use of chemicals and fertilizers are 

 without beneficial effect in wilt control. It has been found, however, 



Fig. 1. A field of Tobacco over 50 per cent of which died from wilt. 



that this wilt disease can be very satisfactorily controlled by the employ- 

 ment, of certain systems of cropping or rotation in which tobacco is not 

 grown on the infested fields for a term of years. A recent bulletinf calls 

 attention to these results but does not outline specific rotation systems 

 to be followed nor does it emphasize the fact that several species of 

 cultivated plants and weeds are attacked by the wilt germ, which fact 

 has an important bearing upon the problem of tobacco wilt control. This 



•In accordance with an agreement between the North Carolina Department of Agricul- 

 ture and the Bureau of Plant Industry of the United States Department of Agriculture, 

 E. G. Moss has assisted in preparing this circular. 



tThe Control of Tobacco Wilt in the Flue-cured District. U. S. Dept. of Agr. B. P. I. 

 Bui. 5G2. 1-20, 1917. 



