TOBACCO WILDFIRE. 81 



five acres of tobacco, entire removal and replanting in this way was prac- 

 ticed with complete success. Practically no infection was found in either 

 field at the close of the season. If the infection is light and the season is 

 not far advanced, only the affected plants should be removed and de- 

 stroyed, and healthy ones from disease-free beds substituted. When a 

 light infection occurs late in the season there is a fair chance of keeping 

 it under control by careful removal of the diseased leaves only. Good 

 control was secured in this manner in a number of fields which came 

 under the \\Titers' observation during the past season. 



Working only with Dry Plants. 

 In the previous pages the connection of water with dissemination and 

 infection has been explained. If wildfire is kno\\'n to be present and one 

 wishes to keep it under control, obviously all operations should cease 

 when the leaves are wet from dew or rain. 



CONDENSED RECOMMENDATIONS FOR CONTROL. 



1. Save seed only from disease-free plants. 



2. Sterilize seed. 



3. Sterilize seed-beds with steam or formaldehyde, or, when the disease 

 has been in beds the previous year, change the location if practicable. 



4. Spray or wash sash, plank or cloth with formaldehyde. 



5. Spray or dust the beds with a fungicide weekly from the time the 

 plants are the size of the thumb nail until setting is completed. 



6. Water beds only sufficiently to keep plants growing. Ventilate 

 thoroughly. 



7. Set plants from disease-free beds only. 



8. If badly diseased plants are found in the field, remove and destroy 

 them. 



9. If infection in the field is light or occurs late in the season, pick and 

 destroy the diseased leaves when they are not wet from dew or rain. 



10. As far as possible avoid working in the tobacco when the leaves 

 are wet. 



LITERATURE CITED. 



(1) Chapman, G. H. Tobacco Wildfire. M. A. C. Ext. Cir. S2. 1920. 



(2) Fromme. F. C. Wildfire and Angular Spot. In Va. Agr. Exp. Sta. Ext. Bui. 



62: 25-30. 1920. 



(3) Wolf, F. A. Tobacco Wildfire. N. C. Ext. Cir. 61. March, 1918. 



(4) Wolf, F. A., and Foster, A. C. Bacterial Leaf Spot of Tobacco. Science 46: 



361-362. 1917. 



(5) Wolf, F. A., and Foster, A. C. Tobacco Wildfire. Journ. Agr. Res. 12: 449- 



458. 1918. 



(6) Wolf, F. A., and Moss, E. G. Diseases of Flue cured Tobacco. N. C. Dept. 



Agr. Bui. 263. 



