116 



MAINE STATE COLLEGE 



Table VII, trees sprayed with copper carbonate in suspension 

 were little better than unsprayed trees, and for comparison they 

 may be regarded as checks. 



The fruit from several trees was examined, with the following 



result : 



2? = ' • * 







Copper carbonate in sus 



pension, (check).... 492 



Ammoniacal solution of 

 copper carbonate...) 556 



123 257 



184' 2G4 



10S 



25.6 Average of three trees. 



86] 3.4 36. 5 Average of two trees. 



In another part of the same orchard two contiguous trees were 

 examined with very similar results. 



As will be seen at a glance, this orchard suffered very severely. 

 Some trees were absolutely without a perfect fruit, and the 

 average amount of fruit that would pass as No. 1, was but little 

 more than one-fourth of the crop. The difference between 

 sprayed and unsprayed trees is not very marked, but the figures 

 point to the fact that there are uniformly beneficial results, even 

 from limited applications. 



An exception to the last statement may be noted in the 

 case of a single tree in Mr. Pope's orchard. This tree was 

 sprayed three times with eau celeste, the last application being 

 made July 28. The amount of scabby fruit was slightly in 

 excess of the average amount on unsprayed trees. The only 

 explanation we can offer is that the leaves fell very badly, and 

 the tree was less able to withstand the attack of the fungus late 

 in the season. Any plant of weakened vitality is more subject to 

 disease than is one of vigorous constitution. 



How to Prepare the Mixtures. 

 Directions for preparing the modified eau celeste, and the 

 ammoniacal solution of copper carbonate, as used at other 

 experiment stations, were given in the report of this station for 

 1889. It may be well, however, to refer to the subject in the 

 present connection. 



Solution A. — Modified Eau Celeste. 

 Dissolve 2 pounds sulphate of copper, ("Blue stone"), in 2 

 gallons hot watei\ In another vessel dissolve 2 1-2 pounds car- 

 bonate of soda (sal soda) ; mix the two solutions, and, when 



