Filbert Aphid
Myzocallis coryli
2 host plants
Last updated
Filbert aphids are small, soft-bodied insects that cluster on filbert buds, shoots, and leaves, causing curling and distortion of new growth. You will see yellowing leaves and stunted branch tips. Heavy populations may cause premature leaf drop. These aphids are particularly problematic in early spring when new foliage is emerging and vulnerable.
Spray insecticidal soap on new foliage as growth begins in spring, targeting aphid clusters before damage becomes severe. Strong water spray can dislodge aphids and reduce populations without chemicals. Encourage natural enemies including lady beetles, parasitoid wasps, and lacewings by preserving flowering plants nearby. Most filberts tolerate light aphid populations without serious impact. Avoid excessive nitrogen fertilizer, which promotes tender new growth that aphids prefer.
Quick Reference
All these aphids are light green in color. Spirea aphid is very difficult to separate from apple aphid without high magnification, whereas apple grain aphid can be distinguished by a yellowish green stripe down the middle of the back. Apple grain aphids infest pear only in the early part of the season, while apple aphid is present all summer. Aphids suck plant sap and live in colonies on new shoots. Populations are damaging only sporadically. Damage appears as rolled leaves, stunted terminal...
Cultural Controls
- Encourage natural predators including ladybird beetles, lacewings, syrphid (hover) fly larvae, and parasitic wasps.
- Avoid use of broad-spectrum insecticides which kill these beneficial insects.
- Hand-wipe or prune to control small, localized infestations when practical.
- Wash aphids from tree with a strong stream of water.
- Control honeydew-feeding ants, which may protect aphid colonies from predators.
- Provide proper nutrition.