366 



STATE HORTICULTURAL SOCIETY. 



By comparing these two tables with the two preceding, it will be seen 

 that less injury was done to the plants than by combinations 1 and 2 with 

 the exception of the grape in one instance. The difference in the grapes 

 may be due to the varieties. Combination No. 3 was more injurious than 

 No. 4 to all the plants except the quince, which was uninjured by the 

 former, as was the pear by the latter. 



The action of these two combinations upon the fungus of the quince was 

 even more marked than of the first two. The sprayed branches showed 

 scarcely any disease Sept. 5, although the remainder of the Angers tree 

 had lost most of its leaves, and the leaves of the Meech were badly affected. 

 At the date of writing, Nov. 12, the foliage of both branches still persists, 

 and in the case of the Angers the sprayed leaves are the only ones upon 

 the tree, excepting the younger ones which appeared after the first set had 

 fallen. From this it would appear that the beneficial action of the 

 ammoniacal carbonate of copper as a fungicide is not diminished by the 

 addition of either London purple or Paris green, for its action is practi- 

 cally the same when no arsenite is added; it is also to be observed that the 

 weak copper combination gave better results than the strong combination 

 in Nos. 1 and 2. Nor was the effect of the arsenite lessened, for when the 

 combination was applied to the potato vines and egg-plants, the beetles 

 were as thoroughly exterminated as when no fungicide had been applied in 

 connection with the arsenites. Consequently it would appear that when 

 the ammoniacal carbonate of copper is applied in connection with London 

 purple or Paris green, the action of neither the carbonate nor the arsenite 

 is weakened. 



No. 5. The ammoniacal carbonate of copper, 3 ounces dissolved in 1 

 quart of ammonia and diluted with 22 gallons of water, and Paris green at 

 the rate of 1 pound in 300 gallons of water. 



No. 6. The ammoniacal carbonate of copper as in No. 5, London purple 

 at the rate of 1 pound in 300 gallons of water. 



In most respects the results obtained by the use of these combinations 

 are very similar to those of the stronger solutions, 1 and 2, except in the 

 case of apples. Their average injury is 30 per cent, greater than that 

 which resulted from the first two combinations. The variety here used 

 was Seek-no-further, and this is probably the cause of the difference. 

 Solution No. 5 injured apple foliage about 30 per cent, more than No. 6. 

 The sprayed branch of the quince was again the best on the tree, and the 

 potato beetles were killed as before. 



No. 7. The ammoniacal carbonate of copper, 1^ ounces dissolved in 

 -| quart of ammonia and diluted with 22 gallons of water, and Paris green at 

 the rate of 1 pound to 300 gallons of water. 



No. 8. The ammoniacal carbonate of copper as in No. 7, London pur- 

 ple 1 pound to 300 gallons. 



