A fine pale mottling develops on the upper leaf surface.
In heavy infestations fine silk webbing can be seen on the plants,
the leaves lose most of their green colour and dry up or fall off.
Heavily infested plants are severely weakened and may die. Spot
them Large numbers of mites, up to 1mm long, and spherical eggs can
be seen on the lower leaf surface (easier to see with a magnifying
lens).
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