What's eating my chinese elm bonsai?

Chinese elm bonsai is one of the more robust bonsai species but still attracts spider mites indoors and aphids or scale when placed outside in summer. Elm leaf beetle can be an issue outdoors. Fungus gnats are a common soil pest when kept indoors. Inspect new growth weekly, especially as seasons change.

Pale speckling on small leaves; webbing on undersides; leaves yellow and drop in severe cases. Raise humidity; spray leaf undersides with water or neem oil; miticide spray for persistent infestations.

Clusters on new shoot tips; sticky honeydew; distorted, curled leaves on fresh growth. Blast off with water; insecticidal soap spray; introduce lacewings if kept in a conservatory or greenhouse.

Brown shell-like bumps on bark and branches; sap depletion causes leaf yellowing. Rub off with alcohol and cotton swab; apply horticultural oil in late winter; check undersides of branches.