How to Identify and Eliminate Aphids on Your Indoor Plants

Opt for organic, non-chemical controls whenever possible

aphids on a houseplant

The Spruce / Phoebe Cheong 

Aphids are tiny sucking insects from the insect family Aphididae. The group includes roughly 5,000 different species, with several hundred that may be a problem for agriculture and gardening. Adult aphids are pear-shaped, measuring less than 1/8 inch in length. The most common aphids on houseplants are the light green ones (pear aphids), but aphids can also be found colored pink, white, grey, and black. Additionally, winged aphids can appear when colonies are established and fly to infect new plants. Juvenile aphids (nymphs) look like smaller versions of the adults.

How Aphids Damage Plants

Aphid infestations tend to develop quickly. The insects are highly mobile: they rapidly travel from one plant to another. In the outdoor garden, aphid colonies are often tended by ants, which feed on aphid honeydew—a sugary liquid that is secreted by aphids as they feed on sap. Indoors, aphids spread between plants by flying or crawling.

Aphids cause damage by sucking sap from new growth on plants. They tend to cluster at the growth end of plants and attach themselves to the soft, green stems. As a result, the new foliage may look crinkled or stunted, with the aphids usually plainly visible around the stem. If the infestation is bad enough, the plant will begin to drop leaves. Finally, like mealy bugs, the honeydew secreted by aphids can encourage the growth of sooty mold and fungus.

Tip

Like most pests, the best control for aphids is defensive. Healthy, vigorous plants are less susceptible to infestation than weak, under-potted, and stressed plants. As a general rule, if you make sure your plants are healthy, you're less likely to attract these annoying critters in the first place.

Understanding the Aphid Lifecycle

Outside, aphid eggs survive the winter by attaching to woody growth. In the spring, the eggs hatch into females. The females give birth to nymphs without mating, and these nymphs rapidly mature into adults (in about 10 days). Males are born in the fall and begin to mate with the females to produce eggs in preparation for the long winter. Indoors, however, there is no winter to slow their reproduction, and female aphids can continue to produce nymphs all year without pause. Thus, the aphid population can quickly get out of control on indoor plants.

What You'll Need

Equipment / Tools

  • Small spray bottle
  • Scissors or small pruning shears
  • Sticky traps

Materials

Keep in mind that you won't need all the following supplies; these reflect the variety of options you have to remove the infestation.

  • Cotton swabs
  • Insecticidal soap
  • Dish detergent and water (optional)
  • Neem oil
  • Rubbing alcohol
  • Homemade insect spray

Instructions

  1. Wash the Aphids Away

    Remove the aphids with your fingers or a cotton swab. This is best for light infestations.

  2. Use Water to Remove Them

    Use a strong stream of water to blast aphids from your plants.

    If the plant has delicate foliage that won't tolerate spraying, you can dip the entire plant in water to dislodge the aphids. Turn the plant upside down and dip the foliage portion into a bucket of clean room-temperature water. 

  3. Try Insecticidal Soap

    Insecticidal soaps are available on the market (such as Safer's Insecticidal Soap), or you can make your own by using a dish detergent such as Ivory Liquid. Try to find a product free of perfumes and additives that might harm plants.

    Mix the soap in a weak concentration with water (starting with 1 teaspoon per gallon and increasing as necessary). Spray on plants, focusing on the undersides of the leaves. 

  4. Use Neem Oil

    Neem oil is derived from the neem tree and thus is entirely organic. Use according to label instructions. Neem oil affects insects' feeding abilities and acts as a repellent. According to the Environmental Protection Association, neem is safe for use on vegetables and food plants as well as ornamentals.

  5. Use a Homemade Spray

    To make a batch, combine 1 garlic bulb, 1 small onion, and 1 teaspoon of cayenne pepper in a food processor or blender and process into a paste. Mix into 1 quart of water and steep for 1 hour. Strain through a cheesecloth and add 1 tablespoon of liquid dish soap. Mix well. The mixture can be stored for up to one week in the refrigerator. Two other types of homemade sprays can also control aphids.

    Tip

    This all-purpose insect spray was developed by the editors of Organic Gardening magazine and has been described in Rodale's Organic Gardener's Handbook of Natural Insect and Disease Control.

  6. Apply Rubbing Alcohol

    Though this method is a little time-consuming, aphids will be killed if you coat them with a swab dipped in rubbing alcohol.

  7. Cut Away Infested Areas

    You can cut away sections of the plant that are heavily infested and dispose of them outdoors. 

  8. Use Sticky Traps

    Sheets or strips of sticky paper hung around your plants will trap any insects that come to visit. Sticky traps are available at garden centers and from online retailers.

  9. Use Chemical Sprays

    Attempt low- or no-chemical solutions first, but if a severe infestation of a prized plant leaves you no option, treat the infestations with a spray that contains pyrethrins, imidacloprid, or pyrethroids. To limit potential harm, try pyrethrin-based sprays, which are low in toxicity.

control aphids on houseplants
 The Spruce
Article Sources
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  1. Fundamentals of Horticulture: Theory and Practice. Delhi: Astha Publishers & Distributors

  2. Bond, C.; Buhl, K.; Stone, D. "Neem Oil General Fact Sheet." National Pesticide Information Center, Oregon State University Extension Services, 2012.

  3. "Cold Pressed Neem Oil (025006) Fact Sheet." Ombudsman, Biopesticides and Pollution Prevention Division (7511P), Office of Pesticide Programs, Environmental Protection Agency, 2010.