Soil Sterilizing 



Bordeaux Mixture and Poisons for Tobacco 



Seedbeds. 



William Titus Home 



In September, 1907,the Department of Vegetable Pathoh >gy 

 prepared Circular No. 28 on the treatment of tobáceo seed- 

 beds for damping off (pudrición) and for biting inseets. The 

 present circular is for the purpose of giving the tobáceo 

 growers the sanie sugestions with such modiñeations as our 

 experience for the past year has shown to be advisable. 



This circular refers mostlyto seedbeds made onthefarm, 

 beside the field where the plants are to be set. However, the 

 use of Bordeaur mixture, poison baits, and lead arsenate or 

 Paris green as suggested later in this circular will be quite as 

 effective in the monte (that is, in seedbeds made on freshly 

 burned off timber land) as on the farm, provided water is 

 available and that some other condition does not maketheir 

 application impracticable. 



SOIL STERILIZING TO PREVENT DAMPING OFF 



Damping off (pudrición) is a well known disease of tobáceo 

 seedbeds in Cuba. It depends entirely on a high degree of 

 humidity in soil and atmosphere for its propagation and is 

 apparently caused entirely by the fungus Rhizoctonia. 



