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HomeBonsaiWhat’s a Root Aphid and What’s Mycorrhiza?

What’s a Root Aphid and What’s Mycorrhiza?

It’s not straightforward to inform the distinction between them. Aphids are detrimental and Mycorrhiza are useful, so now we have to get this proper. Which is difficult, as they’re doppelgängers.

I’ve seen misplaced branches from root aphids, and basic weakening. They’re often present in biggest numbers proper subsequent to the pot wall. Mycorrhiza helps uptake of vitamins and water. Additionally straightforward to see subsequent to the pot wall.

The next photographs present a root mass of a Scots Pine we repotted final week. It exhibits BOTH Mycorrhiza and root aphids. And that is the place it will get tough.


A Scots Pine root mass. Outdated arms at bonsai will say, “Yup, that’s Mycorrhiza.” And also you’d be right. The milky, soft-looking, off-white patches are outlined in crimson.


This facet of the basis ball additionally has Mycorrhiza, however should you seemed rapidly, you’d assume it was all fungus. However solely that outlined in crimson is Mycorrhiza. The remaining—the brilliant white patches—are root aphids.


This facet additionally has largely root aphids, with just a bit Mycorrhiza displaying—the tan coloured patch outlined in crimson. Root aphids are identified by their spotty white, mealy moderately than webby, growths. The aphids themselves are virtually not possible to see within the root mass.


This shot exhibits two root aphids on the pot wall, cream-colored ovoid issues, in the midst of the photograph. Even with a 10x loupe these may be exhausting to see. (There are various root aphid species, and a few don’t make the white poofs we see within the soil.)

Root aphids aren’t straightforward to ID. However should you do discover them, contemplate management, or threat a weakened plant.

A systemic pesticidal drench is a begin, like Safari or Bayer. Some have used drenches of pyrethrins, oils, and Zerotol. Helpful nematodes may additionally provide management.

A number of purposes of controls could also be required as root aphids are NOT straightforward to eradicate. (In a single textual content trade a buddy had “root” autocorrected as “impolite”, which felt correct.)

February 2023 Bulletin Board



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