63 
(c) Copper acetate (0.1 ounce per gallon of water). 
(d) Copper acetate (0.2 ounce per gallon of water). 
(e) Bordeaux mixiure* (0.1 ounce copper sulphate combined with } ounce slaked 
lime per gallon of water). 
(f) Chloride of lime (0.1 ounce per gallon of water). 
(g) Chloride of lime (0.2 ounce per gallon of water). 
(h) Chloride of lime (0.3 ounce per gallon of water). 
The only one of these fungicides heretofore used of so weak a strength 
is the ammoniacal, this being the usual formula. The two varieties of 
plums treated were the ‘‘ Middlebush” and *“*Copper.” The former were 
sprayed May 28, June 12, and June 29; the latter May 6, May 21, and 
June 15. In none of the experiments could any very perceptible dif- 
ference be noted between treated and untreated trees, except where 
chloride of lime was applied. This chemical caused the leaves to fall 
a trifle earlier than on untreated trees. <A similar effect was produced 
upon quinces, as mentioned later on. No injurious effects were ob- 
served upon the foliage from treatments with any of the other chemicals. 
TREATMENT OF PLUM LEAF-BLIGHT IN NURSERY ROWS. 
In the neighborhood of Geneva the seedlings of the “ horse-plum,” a 
form of Prunus domestica, are used extensively for stocks. The vari- 
ous desirable varieties are budded on these seedlings at two and one- 
half years from seed, but it would be desirable if the budding could 
be done when they were one and one-half years old, 7. ¢., in the second 
season. The opinion has been expressed by several nurserymen that 
were it not for leaf-blight the horse-plum seedlings would make enough 
growth by the second season to be fit for budding. 
At the time work was begun at Geneva no seedlings of the first year’s 
growth were obtainable, but it was thought wise to carry on a prelimi- 
nary experiment with seedlings of the second season’s growth. The 
object of the experiment was to ascertain, if possible, whether the 
foliage could be kept intact by the application of the copper mixtures. 
As the leaves of the second season’s growth are almost as badly at- 
tacked by the fungus as those of the first season, the success of the 
experiment would point encouragingly to the prevention of leaf-blight 
the first season. 
The block chosen for the experiment was the property of Mr. O’Brian, 
and was situated in the city of Geneva. The fear of the owner that 
the seedlings would be injured interrupted the experiment before it 
was completed, and only one row instead of two was sprayed with Bor- 
deaux mixture. Five rows finally constituted the experimental block, 
two for control and three for treatment, situated as shown in the table 
below. Thenursery rows were2 feet apart and the individual seedlings 
were planted irregularly. They varied from 400 to 1,200 in each row. 
*One-tenth ounce of copper sulphate, when combined with lime, forms .038 ounce 
copper hydroxide, 
Fs 
