14 



BULLETIN 52, TJ. S. DEPAETMENT OF AGRICULTURE. 



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Fig. 3.— Diagram show- 

 ing the number of days 

 at Miami. Fla., in Feb- 

 raary, 1898 to 1913, in- 

 clusive, with 0.01 inch 

 or more of rainfall. 

 The mean for this 

 period is 2.81 days. 



success which he reports with the use of Bordeaux mixture. He 

 fails to present his experimental data, however, and his statements 

 in this and a subsequent publication ^ in regard to this disease are so 

 general that they are of practically no value to the grower. 



The fact that the mango frequently btooms during 

 the latter part of December and the first part of 

 January has been previously mentioned. It is the 

 rare exception when any fruit is set from .this 

 bloom. Aside from rainy weather at the time of 

 blooming, the extremely heavy dews, which are an 

 almost nightly occurrence during the winter months, 

 are, it would seem, largely responsible for this. 

 The dew point is generally reached shortly after 

 sundown, and by 8 o'clock p. m. plants and other 

 outdoor objects are usually dripping with water. 

 With such ideal conditions for infection the uni- 

 form blighting of the winter bloom is not to be 

 wondered at. 



From a consideration of the data presented, it 

 appears that, while total failures may be expected 

 to occur occasionally, more often the weather con- 

 ditions will be such as favor good settings of fruit on the spring bloom 

 and that this fruit may be brought through to maturity in a clean 

 and disease-free condition by a 

 moderate number of sprayings 

 with Bordeaux mixture. 



SUMMARY. 



The production of mangos in 

 Florida is seriously interfered with 

 in certain seasons by a fungus 

 which attacks the flower clusters, 

 fruits, leaves, and young shoots. 



Infection experiments by the 

 writer and others have shown 

 that Oolletotrichum gloeosporioides 

 Penz. is the cause of the disease. 



The blossom-blight foi-m of the 

 disease is by far the most serious. 

 The amount of damage done by 

 this fungus depends on weather conditions, moist, showery weather 

 being ideal for its ravages. 



Spraying with Bordeaux mixture is of little or no value in prevent- 

 ing the blighting of the blossoms during seasons which are rainy at 



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Fig. 4. — A, Diagram showing the number of days 

 at Miami, Fla., in March, 1898 to 1913, inclusive, 

 with 0.01 inch or more of rainfall. The mean for 

 this period is 4.50 days. £, Crop curve, (a) The 

 failure of 1911 was due to the defoliation of the 

 trees the preceding fall by a West Indian hurri- 

 cane, the trees not blooming that season. 



> Wester, P. J. The mango. Philippine Islands, Bureau of Agriculture, Bulletin 18, 60 p., 9 pi., 1911. 



