TOBACCO WILDFIRE, 



77 



Tabulation of Spraying Results. 



Spray Material. 



Plot 

 Number 



Total 

 Number 



of 

 Plants. 



Number 



of 

 Diseased 

 Plants. 



Per Cent 



of 



Plants 



infected. 



Average 

 Per Cent 

 of In- 

 fection. 



Number 



of 

 lesions 

 per Plot. 



None, . 

 None, . 

 None, . 

 None, . 

 Lime-sulfur, 

 Sulfur, 



PjTOX, 



Pyrox, 

 Bordeaux, . 



Bordeaux, . 

 Sanders dust, 

 Sanders dust, 

 Bordeaux and lead, 

 Bordeaux and lead, 

 Pickering, . 

 Pickering, . 

 NuRexo, 

 NuRexo, 



300 

 251 

 265 

 263 

 298 

 301 

 300 

 270 

 207 

 266 

 232 

 302 

 300 

 298 

 300 

 256 

 300 

 300 



196 

 140 



96 



95 

 168 



19 

 5 



18 

 2 

 4 

 2 

 1 

 

 3 

 1 

 1 

 1 

 2 



66.0 



55.0 



36.0 



36.0 



56.0 



6.0 



1.6 



6.7 



1.0 



1.5 



.8 



.3 



.0 



1.0 



.3 



.4 



.3 



48.25 



56.0 

 6.0 



4.1 



.55 



.35 



936 



549 

 223 

 215 

 562 

 26 



Notes on Substances used, and Results. 



Lime-sulfur. — The ordinary commercial liquid diluted at the rate of 

 1 part to 40. Very severe burning of the leaves occurred within an hour 

 after application. Since, in addition, no control was secured, it is apparent 

 that lime-sulfur should never be used. 



Pyrox. — A commercial Bordeaux paste (arsenical included) prepared 

 by the Bowker Insecticide Company of Boston. Applied at the dilution 

 of 10 pounds to 50 gallons of water. This fungicide was washed from the 

 leaves by the rain to a greater extent than any of the others. 



NuRexo. — A Bordeaux preparation (arsenical included) in form of a 

 powder prepared by the Toledo Rex Spray Company of Toledo, Ohio. 

 Diluted at rate of 8 pounds in 50 gallons of water. Adhered to leaves much 

 better than Pyrox, but not so well as freshly prepared Bordeaux. There 

 was a slight trace of burning, but not serious. 



Freshly Prepared Bordeaux Mixture. — The ordinary 4-4-50 formula. 

 This was washed away by rain least of all the substances which were tried, 

 and was still to be found on the leaves after repeated heavy rains. No 

 burning occurred. 



