20 



MASS. EXPERIMENT STATION BULLETIN 248 



at weekly intervals beginning March 2 and ending July 4. The greenhouses 

 were cleaned out July 3L The results of the experiment are shown in Table 

 10. Both houses in the experiment were subjected to the same conditions. 



Table 10.— Control of Tomato Leaf-Mold with Vaporized Sulfur. Melrose. 

 Spring Crop 1926. 



Fall Crop at Melrose, 1926. Three houses of tomatoes were used. The plants 

 were potted July 17 to 20 and treated with vaporized sulfur in the plant house 

 on August 6, using three stoves. The clieck plants received this single 

 treatment. The houses were set August 20 to 21. Heat was turned on 

 October 1. Seven stoves were used in No. 3 house and six in No. 2 house. 

 Sulfur was vaporized nine times in No. 3 house, the first on August 31 and 

 the last on October 18; and eight times in No. 2 house, the first on September 

 1 and the last on October 19. The houses were cleaned out January 30 to 31. 

 The results are presented in Table 11. 



Table 11.— Control of Tomato Leaf-Mold with Vaporized Sulfur. 



Fall Crop 1926. 



Melrose. 



Fall Crop at Waltham, 1926. Two compartments of the greenhouse were 

 used. The plants were set August 19 to 20, fifteen inches apart in single rows 

 30 inches apart. Eight times at weekly intervals from August 23 to October 

 11 sulfur was vaporized with one stove for periods varying from 60 to 90 

 minutes (connection to disconnection of electricity). The compartments were 

 cleaned out February 1, 1927 (Table 12). 



