New York AGRICULTURAL EXPERIMENT STATION. 385 
with Bordeaux mixture alone or with arsenical poison alone of the 
streneth commonly used in spraying orchards there would be no 
germination of any pollen which might afterwards reach the 
stigmatic surface and so fertilization would be prevented and no 
fruit would be formed. Even the presence of lime alone, of the 
strength commonly used in spray mixtures, prevented the germi- 
nation of pollen. Bordeaux mixture was diluted in aqueous 
sugar solution to 500 parts, 200 parts, 100 parts, 50 parts, 2 parts 
and 1 part in 10,000 of culture media into which various kinds 
of pollen were introduced. Even when diluted to 50 parts in 
10,000 it prevented germination to large extent and where germi- 
nation did occur the growth which followed was decidedly slow 
and the pollen tubes were dwarfed. When diluted to 100 parts, 
200 parts or 500 parts either no germination or practically none 
was found. 
Errect oF Spray Mixtures on APPLe BLossoms. 
In order to test the practical effect of the spray upon open 
apple blossoms the following tests were made. 
Individual blossoms known to have been hit by spray mixtures.— 
Blossoms of Hurlbut and Jefferies were sprayed soon after they 
opened. On the other hand Baldwin and R. I. Greening were 
sprayed several days after the trees commenced to bloom. It is 
instructive to note the different results obtained. On a Hurlbut 
tree which was chosen for one of the tests the blossoms com- 
menced to open May 13. Open blossoms on one side of the tree 
were sprayed the next day with Bordeaux mixture, 1-to-11 form- 
ula, combined with green arsenite of copper, 1 lb. to 150 gallons. 
_ At that time one could rarely find an. anther which had begun 
to discharge its pollen’. Some of the sprayed blossoms were 
examined and those which plainly showed the spray mixture in 
the center were tagged. In case the spray could be clearly seen 
on the stigmatic surface the tag was given a special mark to dis- 
*The structure of the apple blossom is explained and its parts are 
named on p. 395. 
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