I found this insect on my Echinopsis sp. It sort of looks like a tick, but what would a tick be doing on a cactus? What is it, and is it harmful? enter image description here

  • What size is it? Feb 13 '18 at 12:03
  • @GrahamChiu: A couple of millimeters long Feb 13 '18 at 12:22

Looks like a Red Velvet Mite to me, although the pic's not entirely clear. If it is, they're arachnids and predators on other arachnids when mature, when young they may be parasitic, also on arachnids. Generally found in the soil, but they won't cause any harm to your plant https://en.m.wikipedia.org/wiki/Trombidiidae


If it's 1-2 mm in size them it's probably a whirligig mite How helpful are whirligig mites? . Spider mites are .5 mm long and generally need magnification to see.


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