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Scales – Plant Pests

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Pest attacks are much more common outdoors in the garden, but even the most experienced houseplant owner will still fall victim to an attack indoors from time to time. My heart sunk the first time I came across scales. I thought I was doing everything, right?! Don’t worry, though; we will work through it and eradicate these little buggers!

I have only had one case of scales, and that was on a Fig Leaf Plant. It took over a month to find and identify those darn things. I had purchased the plant from a local florist, and I keep in close contact with them once I first noticed that something wasn’t right with my plant. Finally, one night, around midnight, I pulled out Bob’s magnifiers and started to inspect the plant. I was determined to get the bottom of this issue.

There it was, the mother of all scales. I quickly referred to her as the grand-poobah. At first, I didn’t know what I was looking at, but I knew it wasn’t good. Thank goodness for Google, for within just minutes, I had the official name for her… she was a scale! After that discovery, I knew what to look for and went to work.

The scale is a tricky pest to identify and can be challenging to eradicate. The insects have a hard outer brown shell that locks them in place a bit like barnacles on a beach at low tide. They are neatly camouflaged because even if you are looking at them directly to the untrained eye, you may still think you are looking at a natural blemish on the plant leaf. This is why it’s good to own some magnifiers and a Sherlock Holmes hat.

At first, I had all the confidence in the world that I was going to save this gorgeous plant. But, after sending some photos to the floral shop assistance, she told me over the phone to “GET THAT PLANT OUT OF YOUR HOUSE AND TRASH IT!” My heart sunk. If I didn’t have a house full of lush green plants, I would have fought for the Fiddle Leaf’s life. But I couldn’t risk it. The florist told me that she would be a credit on file for me and was sorry for all my trouble.

So, should you find scales on your plant, you will need to be extremely diligent about controlling or removing them. If you catch the problem early enough, pruning out the infested stems could alleviate the problems. Keep a close eye for several weeks to make sure no new scale appears on the plant. Dispose of the pruned stems immediately. And be sure to keep the plant isolated until you know for sure that the situation has been adequately dealt with.

Remove existing scale on houseplants by rubbing gently with a facial-quality sponge or cotton swab dipped in rubbing alcohol. The alcohol alone should kill the scale, but the dead insects will remain on your plants and make it difficult for you to scout for new infestations. The small facial sponges are almost better than cotton swabs because the swabs can leave bits of cotton on the plant, tricking the eye into thinking they are mealy bugs.

What does a Scale do to a plant?

What do they look like?

Where do they linger?

Caution – Before Using a Spray

As already discussed, scale insects are usually divided into two groups: soft scale, and hard armored scale. The soft scale is covered with a protective waxy substance and is a bit easier to kill than the hard armored scale. Armored scale secretes a hard shell over its body for protection from predators. The shell also makes it difficult to use a pesticide because it has trouble reaching the insect inside.

Anytime you use a home mix, it is recommended to test it out on a small portion of the plant first to make sure that it will not harm the plant. Do not spray on hairy or waxy-leaved plants. Also, avoid using any bleach-based soaps or detergents on plants since this can be harmful to them. A home mixture must never be applied to any plant on a hot or brightly sunny day, as this can quickly lead to the burning of the plant.

So, if you find yourself with a host of scales on a plate, take a moment to assess the situation; is that plant close to others where they may have spread? Do I have a place to isolate it as it goes through treatment? Is the plant too far gone? These are the questions that lead you to your next move. Below, I will share the steps on how to fight against a bag case of the scales. You’ll need to catch the invasion early on and act fast since a single scale insect can lay hundreds of eggs, and do so multiple times.

  1. If possible, take the plant outside and spray it down with water. You can also do this in the shower or tub.
    • Wrap the plant pot in a plastic bag to protect the root ball and lower stems. Tie a string around the stems to close it.
    • Place this in your bathtub, shower area, or outside in a place that can wet.
    • Hose the plant down one stem at a time to remove most of the scales with water pressure.
    • Naturally, you will need to determine the fragility of the plant, and if it can handle the water pressure.
  2. Isolate the plant!
  3. Make a Scale Spray by combining the following ingredients;
    • 1 quart (1 liter) of water
    • 1 tsp dish soap
    • 1 tsp neem oil
    • 1 tsp 90-proof alcohol
  4. Spray this solution daily for 3 to 4 days.
  5. Say a little prayer.
  6. Inspect the plant thoroughly before reentering it back into the flock of plants.

For more in-depth information, Google “scales,” You will find a load of photos and treatments that you can use.

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