Question: What is this on my citrus and why are ants always
around
these things?
Answer: The structures on the limbs are scale insects
which are
sucking the sap from the tree and should be eliminated by spraying
with
a summer oil spray or Neem Oil Spray. The ants tend to the "herd"
of
scales (usually brown soft scale), moving the younger (mobile
ones) to
new areas to feed, and protecting all of them from predators.
Not
surprisingly, there is very little sooty mold (black substance
on leaf
surface) associated with these scales because the ants keep the
honeydew
(excrement or secretions of the sucking insects) pretty well cleaned
up.
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