ANTHEAC]SrOSE OF THE MANGO IN FLORIDA. 9 



On March 28 all the flowers were dead and dry, and most of them 

 were still adhering to the pedicels. On April 5 the pedicels showed 

 diseased spots as far as the flowers extended. No infection developed 

 on the peduncles. Both the peduncles and pedicels were covered 

 with Bordeaux mixture at this time. The spots on the pedicels 

 developed beneath the mixture, indicating that infection had taken 

 place through the blossoms. A number of these pedicels were placed 

 in a moist chamber, and they all produced spores of the anthracnose 

 fungus in abundance. These observations coincide entirely with those 

 made on the sprayed seedling tree in the Roop experiment in the 

 spring of 1912. 



Very little infection occurred in 1913 before the blossoms opened, 

 and this was undoubtedly due to the fact that the weather was 

 quite dry during seven of the fu-st eight days that the bloom was 

 putting out. 



Resistant varieties seem to be the only solution of the blossom- 

 blight problem in localities that are subject to rainy weather at 

 blooming time. The Mulgoba mango seems to possess this resistant 

 .quality in some degree. A single Mulgoba tree on the Roop farm 

 bloomed at the same time as the seedling trees used in the experiment 

 in the spring of 1912 and received the same spray treatment on the 

 same dates, from the time the buds began to swell until the fruit was 

 harvested. This tree was located most favorably for infection, in 

 the midst of seedling trees which bloomed at the same time, but it 

 set a good crop of fruit and carried it through to maturity. No fruit 

 was set on the seedling trees, with the exception of the one that was 

 sprayed. 



On the Boggs farm, south of Miami, was found a collection of 

 Mulgoba and seedling mangos intermixed in the planting. Most of 

 these trees bloomed in March, 1912, and none of them were sprayed. 

 The seedlings set no fruit, while the Mulgoba trees set a fair crop. 

 The disease developed, however, quite seriously on the young fruits 

 a week or ten days after they were formed. The peduncles and 

 pedicels developed the disease also, so that none of the fruit was 

 carried to maturity. Plate II, figure 3, shows the diseased condition 

 of the pedicels after the fruit had set. Plate II, figure 2, shows 

 a pedicel which blighted without setting fruit. 



On the Flanders place a similar condition was observed. The 

 flowers on the unsprayed blocks seemed to set fruit quite as well as 

 those on the sprayed blocks, but the unsprayed fruit developed disease 

 a week or ten days after it was formed, and, as the peduncles and 

 pedicels were likewise diseased, practically none of it matured. There 

 is some evidence to show that the Sundersha variety possesses the 

 quality of resistance. 



Briefly, then, it seems that the inflorescence can be kept in a 

 disease-free condition by spraying often enough, and that after the 



