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How to Kill Aphids With Water, Soap & Pepper

Aphids are soft-bodied, pear-shaped pests that eat the sap in leaves and stems, causing the foliage to become dry. As aphids feast on plants, they leave behind a honeydew substance that attracts ants. The honeydew also allows black mold to grow on the plant, which eventually dies.

Things You Will Need

  • Garlic clove
  • Onion
  • Food processor
  • Bowls
  • Cayenne pepper
  • Colander
  • Cheesecloth
  • Spray bottle

Aphids are soft-bodied, pear-shaped pests that eat the sap in leaves and stems, causing the foliage to become dry.  As aphids feast on plants, they leave behind a honeydew substance that attracts ants.

The honeydew also allows black mold to grow on the plant, which eventually dies.  When you notice aphids on a plant, kill them using a homemade solution instead of purchasing chemical insecticides that can harm the environment.

  1. Puree a garlic clove and small onion in a food processor.
  2. Pour the chopped onion and garlic into a large bowl. Add 1 tsp. of cayenne pepper and 1 qt. of water.
  3. Stir the mixture to combine the insect spray ingredients.
  4. Let the ingredients steep in the water for at least an hour.
  5. Line a colander with cheesecloth. Sit a bowl under the colander to catch the liquid. Strain the mixture through the cheesecloth.
  6. Pour the homemade insecticide into a spray bottle.
  7. Apply the insect spray to all infested parts of the plant. Don't forget about the undersides of leaves.
  8. Store the spray in the refrigerator for up to a week. Spray the solution onto affected plants every other day until you kill the aphids.
  9. Tip

    Before using the spray, knock aphids off plants with a stream of forceful water.

    Warning

    Wear gloves to protect your hands and keep the spray away from your eyes and nose because it can cause irritation.

Things You Will Need

  • Garlic clove
  • Onion
  • Food processor
  • Bowls
  • Cayenne pepper
  • Colander
  • Cheesecloth
  • Spray bottle

Tip

  • Before using the spray, knock aphids off plants with a stream of forceful water.

Warning

  • Wear gloves to protect your hands and keep the spray away from your eyes and nose because it can cause irritation.

About the Author

Angela LaFollette holds a Bachelor of Arts in advertising with a minor in political science from Marshall University. LaFollette found her passion for writing during an internship as a reporter for "The West Virginia Standard" in 2007. She has more than six years of writing experience and specializes in topics in garden and pets.