ANTHRACNOSE OF THE MANGO IN FLOEIDA. 7 
fungicide. They did not develop on the peduncles, however, which 
points very strongly to infection having taken place through the 
blossoms. The panicles on the unsprayed tree began to show diseased 
spots on the pedicels and peduncles before their growth in length was 
more than half complete, and practically all of the blossoms blighted, 
the one fruit which set being in the extreme top of the tree. Plate 
IV, figures 1 and 2, shows the typical condition of a blighted panicle 
as compared with one in full bloom which has not yet developed any 
sign of the disease. 
SPRAYING EXPERIMENTS IN THE WINTER AND SPRING OF 1913. 
As during the preceding season, the mangos bloomed quite gener- 
ally during the winter. The buds began to swell about December IS. 
Most of the bloom was shed by January 10 and not 1 per cent of this 
bloom set fruit. 
The buds on two large seedling trees on the Roop place were begin- 
ning to push out on December 24, and one of these was selected to be 
sprayed every other day to test the efficacy of spraying to control the 
blossom-blight form of the disease. It was considered that this 
would be a thorough test," as the blighting of the blossoms is the 
normal thing with the winter bloom. Mr. Roop states that these 
trees have bloomed regularly in the winter for the past six years, but 
have never set fruit from this bloom. Spraying was begun on Decem- 
ber 24 and continued every third day until January 16. At this time 
the fruit had set, and the spraying was continued every fourth day 
until February 3. At tins time the young fruits had reached a diam- 
eter of one-fourth to three-eighths of an inch, and the next two spray- 
ings were applied at 7-day intervals. Two more were applied at 
approximately 10-day intervals and the last on March 22 after a 
lapse of 14 days, when the fruit was about half grown. The dates on 
which spray was applied follow: December 24, 26, 28, 30; January 1, 
3, 6, 8, 10 ; 13 ; 16, 20, 24, 28; February 3, 10, 17, 26; March 8, 22. 
While the tree bloomed profusely, only a fair crop was set. By 
this is meant that the tree could have carried twice as much fruit 
without being unduly burdened. The blossoms on fully half of the 
panicles blighted, and all of those on the unsprayed tree blighted. 
This experiment was carried a step farther in March by spraying 
a portion of a Totafari tree in the Subtropical Garden at Miami every 
day from March 17 to April 1; that is, while the bloom was pushing 
out and developing. This was evidently too much spraying, for, 
while no disease developed, no fruit was set and the young foliage 
was scorched. 
It should also be noted that the fruit on the seedling tree on the 
Roop place received no spray after it was half grown, but it was 
clean and free from disease when harvested the middle of May, 
almost two months after the last spraying. 
