NEW YORK EXPERIMENT STATION BULLETINS. 



365 



September 9 the sprayed branch of the Angers retained all its leaves and 

 but little of the disease was present upon them. The rest of the tree was 

 almost defoliated, and the leaves which still remained were badly affected. 

 During October about one half of the leaves from this treated branch fell, 

 while other treated branches of the same variety retained their foliage. 

 None of the leaves of the Meech were badly diseased, but still the sprayed 

 branch was plainly healthier than the rest of the tree. This branch also 

 lost some of its leaves during October, but not so many as the Angers. 



When these two combinations (Nos. 1 and 2) were applied to potatoes 

 and egg-plants, the potato beetles were as thoroughly exterminated as 

 though no fungicide had been used in connection with the arsenite. 



In each case the foliage of the quince was injured by the solutions, but 

 not so much as to cause any of the leaves to fall before the middle of 

 October. Nor was the apple much injured by the treatment, for none of 

 the leaves dropped; the parts injured were principally those upon which 

 the solution gathered after application, as the edges and ends of the leaves. 

 Very little injury was done to the central surface, and the same is also 

 true of the pears, grapes, and potatoes. Egg-plants were not injured. 

 Peaches suffered the most. All the leaves were shed and the shoots were 

 in several places burned so severely that the sap exuded, and some of the 

 twigs died. The Paris green combination was more injurious to peaches 

 and pears, than that with London purple, while the latter combination 

 injured the apple, quince, and potato more. No difference could be seen 

 on grapes. 



No. if. The ammoniacal carbonate of copper, 1^ ounce of the carbonate 

 desolved in \ quart of ammonia and diluted with 22 gallons of water, and 

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



Dates of 

 applica- 

 tions 



Jnly 13 



" 22 



" 27 



Aug. 10.... 

 " 20.... 



Plants used. 



Apple (Salome) 



Pear (Clapj}).. 



Quince (Angers)... 



Peach (Old Mi.con Free) 



Grape (Does) 



Egg-plant 



Potato (June Eating)... 



Dates of observation and per cent of injury. 



July 23. 





 

 

 

 

 

 10 



Aug. 8. 







5 







70 



20 







20 



Aug. 22. 



5 

 10 





 80 

 30 







Sept. 5. 



10 



10 







100 



30 



No. 4. The ammoniacal carbonate of copper as in No. 3. London purple 

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



