14 
BULLETIN 52, U. S. DEPARTMENT OF AGRICULTURE. 
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1898 
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1900 
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1903 
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1911 
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1912 
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1913 
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Fig. 3. — Diagram show- 
ing the number of days 
at Miami. Fla.,in Feb- 
ruary. 1S9S to 1913, in- 
clusive, with 0.01 inch 
or more of rainfall. 
The mean for this 
period is 2. SI 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 blooms 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 tune 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 Collet ptrichum gloeosporloid.es 
Penz. is the cause of the disease. 
The blossom-blight form 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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1902 
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Fig. 4. — A, Diagram showing the number of days 
at Miami, Fla., in March, 1S98 to 1913, inclusive, 
with 0.01 inch or more of rainfall. The mean for 
this period is 4M days. B. 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 IS, 60 p., 9 pi., 1911. 
