372 



STATE HORTICULTURAL SOCIETY. 



Dates of 

 applica- 

 tions, 



July 21 

 " 29 



Aug. 11 

 " 21 



Plants used. 



Apple (Longfield) 



Pear (Summer Doyenne) 



Quince (Champion) 



Peach ( Wheat land) 



Grape (Victoria) 



Egg-plant 



Potato (Early Rose) 



Dates of observation and per cent, 

 of injury. 



Aug. 8. Aug. 22. 





 

 

 30 

 

 

 





 20 

 10 

 60 

 10 







Sept. 5. 







30 



20 



100 



20 



These results are very similar to those obtained under formula No. 1, 

 with the carbonate of copper. The apple was injured more by No. 1, the 

 peach was affected as badly, but the other plants were injured somewhat 

 more by No. 19. The borate combination, No. 18, injured the same plants 

 as No. 9 with the exception of the quince, and it also injured the pear, 

 making the actions of these two combinations also about the same, although 

 more of the borate was used. The commercial borate of copper costs about 

 30 cents per ounce, but it is considerably cheaper by the pound. 



Conclusion — The action of the borate of copper upon foliage resembles 

 that of the carbonate, both when applied with Paris green or with ammonia 

 and Paris green. 



CHLORIDE OF COPPER (COMMERCIAL) AND ARSENITES. 



The chloride of copper is a greenish crystalline substance readily soluble 

 in water. Its commercial value is about 10 cents per ounce, or 50 cents 

 per pound. 



This substance was also used in several combinations, but as its action 

 upon foliage was entirely unknown the solutions were all made too strong. 

 Later in the season it was tried again, reducing the quantities used. Its 

 action upon fungi is shown on page 373. The following tables show the 

 amounts of injury done to foliage: 



No. 20. Chloride of copper 1^ ounces in 22 gallons of water. 



Dates of 

 applica- 

 tions. 



Aug. 20 



Plants used. 



Apple (Gravenstein) 



Pear (Sheldon) 



Quince (Mammoth) . 

 Peach (Mt.Rose)-... 

 Grape ( Gaertner) . . . 

 Egg-plant 



Dates of observation and 

 per cent of injury. 



Aug. 22. 





 

 

 10 

 

 



Sept. 5. 



5 

 

 

 70 

 

 



No. 21. Chloride of copper, 1^ ounce in 22 gallons of water, Paris green 

 at the rate of a pound in 200 gallons of water. 



