278 Report oF THE HorTICULTURAL DEPARTMENT OF THE 
assumed that the difference in percentages of copper used in 
bordeaux mixture has, except within wide limits, very little to do 
with the action of the contained copper on the foliage.” I feel 
sure that this statement does not hold with apples and I should 
have to see definite data before I could believe that it is true with 
other fruits, though in practice I have seen instances in which injury 
was greater with weak than with strong bordeaux mixture in the 
same orchard. I take all such instances to be exceptions, however. 
(b) As to the control of the scab fungus. Tables II and X 
show that the percentages of scabby fruit on the check trees in 
all of the plats are low. In the average season, on the varieties 
in question, the percentages would run from four to six times as” 
high. The results in this season’s investigation do not, therefore, 
represent the average year. The experiments were not planned, 
primarily, to show the value of different strengths of bordeaux 
mixture in controlling the scab fungus; and no special study of 
this problem was made in the field. Therefore, the results to be 
given under the head of this topic are only interesting and 
suggestive. 
Table VII shows that with one Rhode Island Greening tree in 
each plat sprayed during rain, the percentages of scabby fruit 
decreased quite uniformly with the increase in the amount of copper 
sulphate in the mixture. Table VIII with two Baldwin trees in 
each plat, sprayed during dry weather, shows varying data in respect 
to strength of bordeaux mixture in controlling the scab fungus. 
The differences shown are so slight that: they are not out of the 
range of fortuitous variation. With the two Rhode Island Green- 
ing trees in the several plats, sprayed as were the Baldwins, there 
are somewhat marked differences between the least amount of 
copper sulphate and the greatest amount of the fungicide used, 
but the differences in the trees taken serially prove little or noth- 
ing; thus the 3-3-50 plat and the 4-4-50 plat give the same per- 
centages, 2.8 per ct. of scabby fruit; while the 2-4-50 plat gives 
4.5 per ct. more of scabby fruit than the 1-2-50 plat and the 4-8-50 
gives 1.8 per ct. more infected fruit than the 3-6-50 plat. 
The general trend of the results favors the stronger solutions 
in the control of the scab fungus; yet I believe, from observations 
made in a number of orchards sprayed with the weaker solution 
than the 4-4-50 now commonly used’in this State, that we shall 
find it practicable to decrease the amounts of copper sulphate and - 
lime to,at least 3-3-50 in spraying for apple scab. The difference 
