The feeding activity of the mite causes an irritation to the leaf
tissues, which results in the plant producing the blister-like
structures. The blisters cause little damage to the tree. The
damage is primarily aesthetic as it only impairs the visual beauty
of the tree. The mites can also infest the green husk of the nuts
causing a russeting or blackening of that tissue.
Spot them
The blister mite is microscopic in size, and you need at least a 10
x magnification to see the mites crawling among the hairs in the
blister on the undersurface of the leaves. The mites are creamy
white and cigar-shaped.
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