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They’re called plant lice for a reason. Although aphids are fragile insects, they are not harmless, and can damage your trees and landscape plants. Follow our advice to help your most valuable natural assets survive the summer months.

What do aphids look like?

Aphids comprise several species; some are orange, green, red or black while others are woolly, spotted or bull-legged. Regardless of their hue and label, they are hungry!

What are the symptoms of an aphid infestation?

They feed off deciduous trees’ leaves and evergreens and cluster in large colonies to attack new growth.

Early season aphids cause leaf curling and new growth distortion similar to broadleaf weed herbicide damage. If there is a large aphid colony, twig dieback and stunting may occur.

Many aphids excrete honeydew—a sugary substances that collects on lower leaves and objects underneath infested trees, such as cars, lawn furniture and sidewalks. Honeydew attracts a fungus called sooty mold. The fungus is not an actual plant pathogen as it grows only on the honeydew, not the plant. Sooty mold gives tree leaves and branches a black, sooty appearance. This fungus doesn’t injure the leaves, but it blocks sunlight which reduces photosynthesis. Lack of photosynthesis can cause problems such as premature leaf drop.

Solutions and Treatment

Aphids are controlled through the use of horticultural soap treatments or other insecticides. Therefore, these treatments can ultimately stop honeydew and sooty mold from occurring.

Lady beetles are a natural predator of aphids, so it’s important to check for their presence and to make sure an insecticide that is detrimental to them is not used.

Frequent inspections for aphids on susceptible plants should be done to reduce plant injury.

Contact your local certified arborist to ensure your trees survive the summer months in the best shape possible. 

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