Find out what scale looks like on houseplants. How to tell if your houseplant has scale. See what scale looks like, so you can determine if your houseplant has scale. Scale are small insect pests that suck plant sap and can eventually kill plants. You can use horticultural oil to kill scale.
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Today, we are talking about scale. In this video, I’ll show you what scale looks like, explain how it behaves, and tell you exactly what to do to control and eliminate it.
Scale insects appear as smooth, oval pests that range from light brown to dark brown, and sometimes gray. They may look shiny, but not always. Scale typically attaches to the underside of leaves, along the leaf midrib, or onto stems.
These pests cause yellow leaves, leaf drop, and a sticky secretion that attracts black sooty mold. This mold can be rinsed off, but the underlying pest must be treated immediately. Scale is similar to mealybugs—they suck sap from plant tissue, causing yellow spots that eventually dry out, turn brown, and leave holes in the leaves.
As they feed, scale insects secrete a honey-like substance that can drip onto floors and cause mold. Left untreated, a heavy infestation can kill the plant.
This arrowhead plant has a light infestation. If you discover scale, isolate the plant immediately. Even if other plants look fine, scale eggs can remain hidden in soil for months before emerging.
I have already treated this plant using a horticultural oil. There are different types available, and in another video, I’ll show how to mix and apply them properly. For now, I want to show you what scale looks like so you can identify it on your own plants.
Manual removal works well, especially at the beginning. Insecticidal soap and rubbing alcohol can also help dry out and kill scale.
Looking closer, this variety of scale appears as small tan bumps. They’re difficult to remove—unlike mealybugs, scale clings tightly to the plant, similar to ticks. Remove them carefully to avoid damaging leaf tissue.
If the bumps can be gently removed without tearing leaf tissue, it’s scale. If removing a bump damages the leaf, it may be edema, which I explain in another video linked below.
Removing scale can be time-consuming but is necessary to protect your plant. Scale damage can also cause leaf curling, as the leaf tissue becomes compromised.
Scale can be treated with insecticidal soap, horticultural oils, or botanical controls, including beneficial predators used in greenhouses such as parasitic wasps or small predatory beetles.
Thank you for stopping by today. Please leave comments about any indoor gardening tutorials you’d like to see. Remember to like, comment, subscribe, share this video, and click the bell to be notified of new releases.
Frequently Asked Questions
What does scale look like on houseplants?
Scale insects appear as oval, smooth bumps ranging from light brown to dark brown or gray. They attach tightly to leaves and stems, often along the midrib or underside of leaves.
How does scale harm houseplants?
Scale insects suck sap from plant tissue, causing yellow leaves, spotting, leaf drop, and eventually brown dead patches. Their sticky secretion also leads to black sooty mold.
How can I remove scale from my plants?
You can manually remove scale using a gentle tool, apply horticultural oil, insecticidal soap, or use rubbing alcohol to dry them out. Early detection makes removal easier.
Should I isolate a plant with scale?
Yes. Always isolate infested plants because scale eggs can remain hidden in soil and emerge later, potentially spreading to other houseplants.
What are natural or botanical controls for scale?
Beneficial insects such as parasitic wasps and small predatory beetles can be used to control scale. These natural enemies are commonly used in greenhouses.
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Link to horticultural oil to treat scale pests: https://amzn.to/35j1L2S