Aphids are Insects and How to Control Them on Your Houseplants

by | Aug 25, 2017 | 4 comments

Aphids are the subject for this blog post. In the last two weeks, I have been in two locations that have plants that are infested with insects, one much worse than the other.

The first place, an antique shop on the west side of the state, has an amazing hoya. I was told about it before I went there and was more excited about seeing the plant than the antiques. I’m crazy that way-and I LOVE antiquing. (Believe me, I found some things after oohing and aahing over the plant.)

Hoya with problems

The hoya was hanging next to the register and extended to the ceiling, which was at least 15 feet high.

While taking pictures, I noticed that the plant had a shine that wasn’t normal. So, I took a closer look and a problem became clear to me. The shiny substance was honeydew.

Aphids have invaded

The plant had aphids. The honeydew is the excretion of the insects. Yuck!

Aphids are small pear-shaped insects that are usually found on the new growth of plants. They also may be on the flowers.

Identifying Aphids

They can be different colors depending on what they eat. These were a yellowish color, but it’s not uncommon to find black and red ones. They also have two little tubes protruding from their abdomens, called cornicles.

How did aphids get in the antique shop where the hoya has been hanging healthy for years? Most likely they flew in the door which is open a lot in the summer.

Aphid reproduction

As you can see in the pictures below, some of the aphids have wings. The females give birth to live babies that can then give birth to their own babies in 7-10 days. They are parthenogenetic, which means they can produce young without mating.

You can see how this could quickly get out of hand. The interesting thing is they don’t produce aphids with wings unless they need to. If the plant can no longer support the amount of insects on it, the females will produce winged aphids. They can fly away and infest other plants. So weird.

Telling the owner about the aphids

I broke the news to the owner who is extremely fond of the plant. He said he had noticed a difference in the flowers when they fell. He even had the monitor of his computer covered to protect it from falling debris and had a flower to show me.

As you can see below, the spend flower is covered with the shells left from when the aphids molted.

Molted? What is that? Aphids usually go through four molts before becoming an adult. Those skins, like when a snake sheds its skin, are left behind.

molted skins on hoya flower
A flower bud with aphid moltings attached

Sooty Mold

The sticky honeydew can grow sooty mold (see below). It can block the light, so the plant cannot photosynthesize well. It is unattractive but it can be wiped off.

sooty mold from honeydew
Black sooty mold growing on the honeydew. Notice the aphids on the right on the flower stalk

Control of aphids

The owner asked what he could do to get rid of them. Usually, aphids are simple to remove because they are easy to wash off with a stream of water.

Yet, this plant is over his computer and is a huge plant. It would be impossible to remove it by spraying it with water. It would also be impossible to spray it with an insecticide, insecticidal soap, or Neem oil. All work well to control aphids.

Sooo, I suggested he use a systemic insecticide applied to the soil. This product moves up into the plant and makes the plant toxic for the insect to eat. Hopefully, he can get them under control and save his prize plant!

Always identify the problem first

So the first thing to do when you feel there is a problem with your plant is to find out what the problem is.

Is it cultural? Water, light, soil, etc. Or, does it have an insect or mite attacking? After you’ve found the origin of the problem, figure out what it is exactly.

The identification of the problem is the key to figuring out the solution and treatment. For example, if your plant has spider mites, you are not going to use an insecticide. Mites aren’t insects.

The chemical wouldn’t work. And spraying your plant with whatever chemical you have, is not a good idea. Use chemicals sparingly and only after reading the label.

The next insect pest I saw will be in the next blog post. Stay tuned! Let me know in the comments below if you have had aphids on your houseplants and how you eradicated them.

Have a great week, plant friends!


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  1. Paul Cartwright

    A really interesting post thanks! As long as there aren’t too many aphids I am prepared to squish them by hand. Pretty gross but also strangely satisfying! And harmless to the plant at least 🙂

  2. Ashley

    Can you elaborate on the best way to use neem oil?

    • Lisa Steinkopf

      Hi Ashley. I buy the Neem oil spray in a ready to use spray and spray it directly on the plants. I haven’t had any problems, but it will take the blue color off plants such as echeveria and aeonium.


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