~ aye" 65 
Row IV.—Ammoniacal solution of copper carbonate. 
Nomber of trees _.-..- .---.- ----------=- +--+ -+------+------=- 490 
Number of sample trees..--.---------------------------------- 24 
Total number of leaves ------------------------------ Sat ae ae 923 
Average number of leaves -.----------- ------------------+--+--- 38. 4 
Row V.—Ammoniacal solution of copper carbonate. 
MmmNet Wl A9CeS 27 o oe ee See ee = 5524 R S26 ear - E Se es -> 1, 200 
Number of sample trees.-.-----.------------------------------ 60 
Total number of leaves ----------.--------------------------- 1, 708 
Average number of leaves.-..-------------------------------- 28. 04 
TESTS OF FUNGICIDES FOR QUINCE SPOT.* 
An experiment was made through the courtesy of T. C. Maxwell & 
Bros.. in one of their large orchards, to test the efficacy of a few fungi- 
cides as preventives of quince spot. The orchard is situated a few 
miles from Geneva, on the east side of Seneca Lake, and is planted en- 
tirely with the apple or orange variety of quince. The method of culture 
is perfect, but for several years the fruit and foliage has been seriously 
affected by “‘spot.” The block chosen for experiment was in that por- 
tion of the orchard which had suffered most severely the previous year, 
and consisted of three rows of thirty-four trees each. The trees of 
only the center row were treated, the rows on either side being left for 
eontrol. Each experimental plat consisted of three trees, two of which 
were sprayed three times; first, just as the petals were falling, May 29, 
and twice afterward, June 15and 29. The remaining tree was treated 
twice more, on July 16 and 30. Hence No. 1 of each plat received 
five treatments while Nos. 2 and 3 received only three. The solu- 
tions used were calculated to deposit upon drying on the leaf as nearly 
as possible .1 of an ounce of the salt from every gallon of the mixture. 
This quantity is as closely as possible that deposited by every gallon 
of the regular ammoniacal solution of copper carbonate, viz, 3 ounces 
copper carbonate dissolved in ammonia and diluted with 22 gallons of 
water. The following were the fungicides used. As seen below, d, /, 
and g were twice or thrice as strong as the above: 
(a) Bordeaux mixture (7.5 grams copper sulphate,t 10 grams slaked lime, 2 gallons 
of water. 
(b) Copper acetate (7.5 grams wet with 30°° water, and after standing from twelve 
hours to twenty-eight days diluted with 2 gallons of water). 
(c) Potassium sulphide (7.5 grams dissolved in 1 ounce of water, and after standing 
from twelve hours to twenty-eight days diluted with 2 gallons of water). 
(d) Copper acetate (15 grams wet with 60° of water, and after standing from twelve 
hours to twenty-eight days diluted with 2 gallons of water). 
*Eniomosporium maculatum Léy. 
+ Seven and one-half grams of copper sulphate, CuSo+5H,0 give, upon precipita- 
tion as the dry hydrate, only 2.8 grams of Cu(OH),.. Consequently the amount of 
salt thrown on the leaf is smaller than at first calculated, less than .05 of an ounce 
per gallon of water. 
2316 —_No, a—_—5 
