Tuliptree aphid
2 host plants
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Large, dark-colored aphids cluster on the petioles and midribs of tulip tree (Liriodendron tulipifera) leaves. Heavy infestation leads to wilting, yellowing, and leaf drop. Honeydew production attracts ants and allows sooty mold growth. Damage is primarily in summer when colonies expand on new growth, though western Washington occurrence is limited due to climate.
Prune heavily infested shoots in early summer and discard plant material. Spray horticultural oil or insecticidal soap on leaf undersides. Monitor new growth and remove affected leaves by hand on small trees. Encourage natural enemies by avoiding broad-spectrum pesticides. Most populations are naturally suppressed by cooler autumn temperatures.
Quick Reference
Host Plants
2
Cultural Controls
- biological control Many parasites and predators attack aphid.
- Monitor the proportion of aphid mummies to unparasitized adults and the number of predators such as lady beetles.
- If the biocontrol agents appear to be gaining control, avoid sprays which would disrupt this system.
- Most products available for aphid control are highly disruptive of natural enemies.
- Management-cultural control Aphid populations tend to be higher in plants that are fertilized liberally with nitrogen.
- Prune out suckers...