Oregon maple aphid

Systematic position: The Oregon maple aphid (Drepanosiphum oregonensis) belongs to the order Hemiptera and the family Aphididae. It is a specialized insect pest that primarily colonizes trees of the genus Acer, functioning as a significant herbivore in forest and ornamental ecosystems.

Host plants: The primary host is the bigleaf maple (Acer macrophyllum). However, this species can also be found on various other maple species used in landscaping. Its presence is often detected in regions where these specific trees are native or widely planted for aesthetic purposes.

Biology and life cycle: The life cycle is typical of many aphids, involving overwintering eggs laid on the bark of twigs. As temperatures rise in spring, nymphs emerge to feed on developing buds and leaves. The species undergoes several generations throughout the summer, utilizing parthenogenesis for rapid population expansion.

Damage and severity: Aphids congregate on the undersides of leaves, piercing tissues to extract plant sap. This feeding causes foliage to curl, yellow, and drop prematurely. Additionally, the production of honeydew promotes the growth of sooty mold, which can block photosynthesis and lead to the aesthetic degradation of the host tree.

Control measures: Integrated Pest Management (IPM) is recommended to manage this pest. Key practices include:

• Promoting natural enemies like lady beetles and lacewings.
• Using horticultural oils during the dormant season to destroy eggs.
• Applying systemic insecticides if infestations threaten tree health.
• Ensuring proper tree care to improve natural resistance.