378 



JOt'RKAL OF ECONOMIC ENTOMOLOGY 



[Vol. 1 



TABLE FOB FORMULA a 



Total number red spiders left on plants sprayed, 167 ('). 

 Total number red spiders left on plants unsprayed, 533. 



The above figures show a total of 76 per cent killed by the one spray- 

 ing; the plants showing no injury from the spray. 



Experiment No. 2. — May 28, 1908. Lye-sulphur (1 pound sulphur 

 and y2 pound of lye to 40 gallons of water, c) was sprayed on a row 

 of wax beans, using an underspray. The spray was applied at 10.15 

 a. m., the day being cloudy and there being a fair breeze. On ]May 

 30, 1908, an examination was made of a number of sprayed leaves and 

 checks, the results of which are as follows : 



TABLE FOE FORMULA C 



This count gives 98.4 per cent killed by the one spraying, and seems 

 a very high percentage to the writer. The plants show no injury 

 resulting from the spraying. 



Experiment No. 3. — ]\Iay 28, 1908. Sulphur (1 ounce to 1 gallon 

 of water, d) was sprayed on a row of wax beans, using the under- 

 spray. The spraying was done at 11 a. m., the sun shining brightly 

 and there being a fair breeze. On May 30, a number of sprayed 

 leaves and checks were examined with the following results : 



TABLE FOR FORMULA d 



1 Of the sprayed leaves, one examined liad 100 red spiders upon it and, it seems to the 

 writer, that a truer result would be obtained by ignoring this one leaf and its check. 



