Insects Injurious to the Mango. 13 
CHARACTER OF INJURY. 
The mango shield scale in- 
fests the lower surface of the 
mango leaves, where it is to 
be found usually clustered in 
rows along both sides of the 
midrib and the lateral veins. 
Like all other scales, this 
species does damage princi- 
pally through the extraction 
of the sap contents of the 
plant. An indirect injury 
also results, in that, like many 
other scales, this species pro- 
duces an abundance of honey- 
dew. This honeydew collects 
on the bodies of the scales, 
and when the drop is suffici- 
ently large it falls either to 
the upper surface of lower 
leaves or to fruit below. The 
sooty-mold fungus develops 
in this honeydew, the accu- 
mulation of which gives in 
time a decidedly blackened 
appearance to the foliage and 
fruit (fig. 7). The writer 
has observed several groves 
where the sooty mold was so 
abundant that even the 
branches and trunks of the 
trees were blackened by it. 
SEASONAL HISTORY AND DE- 
SCRIPTION. 
The adult scale.—The adult 
scale is yellowish green, 
bluntly pointed in front, and 
broadly rounded posteriorly. 
It is very thin and flat and 
irregularly marked with 
black. There seems to be no 
dormant period in the life of 
this scale, as young are to be 
Fic. 6.—The mango shield scale: Showing 
scales along the midrib of the lower surface 
of a mango leaf. 
