NEW YORK EXPERIMENT STATION BULLETINS. 



371 



Here the addition of Paris green again causes a greater injury to the 

 foliage, the quince and the grape as well as the peach being affected. The 

 other plants were uninjured, and from this it would appear that the hydrate 

 of copper may be of some value in combination with Paris green. 



Conclusions. — The hydrate of copper when applied alone does little 

 injury to the foliage, only the peach being affected. 



When Paris green is added to the hydrate the combination is more caus- 

 tic than when either is applied alone, the injury to the peach being much 

 increased. The quince and the grape were also injured. 



BOKATE OF COPPER (FROM LABORATORY) AND ARSENITES. 



Several combinations were made with the borate of copper to determine if 

 it possesses any value as a fungicide, and to ascertain what its action would 

 be when arsenites are added. This substance closely resembles the car- 

 bonate of copper and is insoluble in water. For its value as a fungicide 

 see page 331. The following tables show its effect upon foliage: 



No. 17. Borate of copper at the rate of ^ pound in 22 gallons. 



Dates of 

 applica- 

 tions. 



July 21 



" 29 



Aug. 20 



Plants used. 



Apple (N. Ipy) 



Pear (Hardy) 



Quince (Champion) 



Peach (Globe) 



Grape (Lady Washington) 



Egg-plant..' 



Potato (Early Rose) 



Dates of observation and per eent. 

 of injury. 



Aug. 8. 





 

 

 10 

 

 

 



Aug. 22. Sept. 5. 









 

 10 

 

 





 

 

 20 

 5 

 



The peach and the grape are the only plants injured. 

 No. 18. Borate of copper at the rate of \ pound in 22 gallons of water. 

 Paris green 1 pound in 200 gallons of water. 



Dates of 

 applica- 

 tions. 



July 21 



" 29 



Aug. 21 



Plants used. 



Apple (N. Spy) 



Pear (Seckel) .. 



Quince ( Champion) . . 



Peach (Globe)... 



Grape (Empire State) 



Egg-plant 



Potato (Early Rose). 



Dates of observation and per cent, 

 of injury. 



Aug. 8. 





 

 

 20 

 

 

 



Aug. 22. Sept. 5. 





 

 

 30 

 10 

 





 5 





 48 

 20 



The peach and the grape are again injured, and also the pear, showing 

 that the addition of Paris green made the solution more caustic. 



No. 19. The ammoniacal borate of copper, 3 ounces of the copper dis- 

 solved in 1 quart of ammonia and diluted with 22 gallons of water, and 

 Paris green at the rate of 1 pound in 200 gallons of water. 



