11 



seed, if desired, or the vetch can be added as is done the first year. There 

 will undoubtedly be an increasing demand for vetch seed for a num- 

 ber of years, and they can be easily grown in combination with one 

 of the small grain crops. 



In all of the rotations suggested in this circular, the relation of other 

 crops to tobacco and also the effect the crops other than tobacco have 

 on the control of this tobacco wilt have been kept in mind. It is 

 essential that all land infested Avith wilt be kept free from weeds, and in 

 planning these rotations, the authors have, tried to suggest combinations 

 of crops that are entirely practical and that may be used in such a way 

 as to prevent the land from growing a crop of weeds at any time. It is 

 also suggested that the grower select the rotation that may be adapted 

 to his conditions and adhere to it, and if he should have a field on which 

 only a few plants die from the wilt, after he has followed his rotation 

 for a number of years, it is not advisable to plant this field to tobacco 

 again until he has followed the cycle of rotations with which he started. 



It is doubtful if the wilt germ will ever be entirely eradicated from 

 the soil after it is once infested, but it can be controlled to such an 

 extent that tobacco can be grown with only a small percentage of loss. 



