408 EXPEBIMKNTS WTTH PLANTS 



Weeds, volunteer Grain, etc., along roadsides and in 

 fence corners may harbor the disease, and hence should 

 be kept down as much as possible. 



(3) Rotation of crops in the case of diseases which 

 can live in the soil; this allows them to die out in the 

 interval between crops. Plants with such diseases 

 should be burned rather than plowed under. 



(4) Disinfection of seed, seed bins, thresher, etc. 



(5) Careful attention to wounds, cuts made in 

 pruning, etc. These should be repeatedly painted with 

 tar to prevent the entrance of disease. 



Among the books whioli may be consulted on the subject of the chapter 

 are: Conn: "Story of Germ Life," "Agricultural Bacteriology;" Newman: 

 "Bacteria." 



