Understanding Scale Insects in Washington Township, MI

Scale insects are tiny pests that can cause a lot of damage to plants and trees in Washington Township, MI. These insects belong to the superfamily Coccoidea and are notorious for their ability to damage a wide range of trees, ornamental shrubs, and plants in general.

Identifying Scale Insects

Scale insects are divided into two main categories: armored scales and soft scales. Armored scales, such as the Euonymus scale, are protected by a hard, shell-like covering, while soft scales, like the Cottony Maple scale, have a waxy, softer coating. These pests are often mistaken for plant diseases because they remain stationary for much of their life and appear as small bumps on branches, leaves, or stems. They are particularly challenging to spot due to their size, which ranges from 1/16 to 1/8 inch. Mature females, the most damaging scale insect, can blend into the plant’s surface, making early detection difficult.

Spruce Bud Scale. Photo: Steven Katovich, Bugwood.org

The Damage They Cause

Scale insects feed by sucking sap from the plants, which weakens the plant and can lead to yellowing leaves, stunted growth, branch death and even plant death in severe infestations. The soft scale group also excrete a sticky substance called honeydew, which can cause sooty mold, a fungal growth that covers foliage, stems and anything else under the host tree.

In Washington Township, scale insects are a common concern for residents with landscapes featuring maples, oaks, magnolias, and conifers. Our cold winters do little to eradicate them, as many species are adept at surviving harsh conditions.

Magnolia Scale on branch.  Photo: Whitney Cranshaw, Colorado State University, Bugwood.org

Controlling Scale Insects

Effective management begins with early identification. Inspect your plants regularly, especially during the growing season. Prune heavily infested branches and dispose of them properly to prevent spreading scale insects to other areas in your landscape.

For large infestations, horticultural oil and insecticide sprays can suffocate and kill the insects during their vulnerable crawler stage. Systemic insecticides are also effective but should be used carefully to protect pollinators and other beneficial insects.

Protecting Your Plants

In Washington Township, MI, maintaining plant health is key to preventing scale insect infestations. Ensure proper watering, mulching, and fertilizing to keep your plants vigorous and resilient. If you suspect a scale problem, consult with a local ISA Certified Arborist at Owen Tree & Lawn Care to develop a treatment plan tailored to your landscape and the type of scale insect infesting your plants.

By staying vigilant and proactive, you can keep these troublesome pests at bay and ensure your plants thrive year-round.