
180 REPORT OF THE DIRECTOR OF THE 
will be published in a bulletin of the department, was made to 
ascertain the relative value of the ammoniacal solution* and a 
weak Bordeaux mixture ¢ as preventives of leaf-blight. The result 
showed beyond question the efficacy of the latter over the former. 
In the plum orchards of T. C. Maxwell & Bros. and A. Ham- 
mond, a comparative test of six different fungicides was made 
with a view of ascertaining if the early application of these mix- 
tures would prevent leaf-blight and the consequent premature fall | 
of the leaves, caused by Cylindrosporium padi, Karsten. These 
early treatments failed and the necessity of continuing the spray- 
ings throughout the season was thus made manifest. In this case 
only dilute copper solutions, such as the ammoniacal, or a weak 
Bordeaux mixture, should be used. 
Quince leaf-blight and fruit-spot were treated in the orchard of 
T. C. Maxwell & Bros., with five different fungicides. These were 
as follows, in the proportion of 0.1 ounces of the chemical to a 
gallon of water (two and three-fourth ounces per twenty-five 
gallons); Bordeaux mixture, normal cubic acetate, chloride of 
lime, malachite (basic cupric carbonate) and glue mixture and 
potassium sulphide; Bordeaux mixture, cupric acetate, and the 
mixture of malachite and glue proved effective and increased the 
percentage of fair fruit from eighteen to thirty-five per cent over 
that of adjoining trees, and forty to forty-five per cent over the 
average of untreated trees. On the other hand potassium sulphide 
and chloride of lime actually seemed to increase the amount of 
fruit spot from twenty to thirty-eight per cent over that of 
adjoining trees, and from nine to thirty-six per cent over that of the 
average of eighteen untreated trees. 
At Brockport a series of tests was made upon forty trees, four 
standard fungicides being used. Owing to the ma of 
the disease the experiments were wholly negative. 
The presence of a destructive currant cane disease was estab- 
lished through the kindness of Mr. John Burroughs of West 
Park, on the Hudson. This gentleman sent in specimens of the 
diseased plants and offered an opportunity of examining them at 
his residence. The disease has been ascertained by means of 
_—_— 
* Two ounces copper carbonate dissolved in twenty-six per cent Benonls and diluted 
with twenty gallons of water. 
ft Two pounds of copper sulphate and one pound of lime in twenty gallons of water. 

