394 RmeporT oF THE HORTICULTURAL DEPARTMENT OF THE 
There was very little fruit produced on any of the Pumpkin 
Sweet trees whether they were sprayed in bloom or not. The 
Baldwins produced considerable fruit, but not a good crop. 
SUMMARY OF RESULTS OF THE TESTS OF THE EFFECT OF SPRAY 
MIXTURES ON APPLE BLOSSOMS, 
In the orchards where trees were sprayed in bloom general 
observation at the blooming season and at various later periods 
till the fruits were as large as cherries, and a comparison of trees 
so treated with corresponding trees which were not sprayed in 
bloom, forced the conclusion that much fruit was destroyed by 
the treatment. That the yield of the treated trees was not more 
seriously diminished may be accounted for by the very great 
abundance of the blossoms and by the fact that at no one time 
were all of them open and in that stage when they are most 
susceptible to injury. Under such conditions one treatment 
during the blooming season, if properly made, could not be 
expected to cause the loss of a large percentage of the crop of 
ripe fruit. 
In the tests where the trees were sprayed repeatedly during 
the blooming season so as to hit as many as possible of the new 
blossoms which opened from day to day, but very few blossoms 
survived the treatment and consequently but little fruit set. 
This shows that the ordinary spray mixtures surely prevent the 
setting of fruit when applied to the blossoms soon after they open. 
If the tree should have a scant amount of blossoms it would seem 
that serious loss might result from such treatment. 
In some cases the spray mixture had a corrosive effect and 
killed the tissues of the stamens and pistils. In other cases pis- 
tils with particles of the spray mixture on the stigmatic surfaces 
awaited fertilization for several days, apparently unharmed and 
perfectly healthy, but eventually withered and died. A number 
of blossoms were observed which showed particles of spray mix- 
ture on the stigmatic surfaces, but none of these set fruit. It 
appears therefore that in these cases the spray mixture inhibited 
