Homemade Insect Spray for Vegetables


Insecticidal soaps, made from organic ingredients, are effective on a number of garden pests and safe to use on vegetables. They can be purchased at gardening centers or made at home. Many common vegetable garden insects have a protective covering on their surface that is washed away by insecticidal soaps. When used on aphids, the soap actually clogs their breathing holes, according to Farm Advisers with Washington State University. When spraying vegetable plants, spray directly on the infested surfaces. Repeated applications may be necessary.

Step 1

Mix 2 tablespoons of liquid detergent in one gallon of water. Scientists at New Mexico State University suggest using Ivory Liquid dishwashing detergent. If you prefer using a certified organic soap, try Dr. Bronner's peppermint or Castile liquid soap at the same dilution rate.

Step 2

Add the mixture to the spray bottle and shake it until it is completely combined.

Step 3

Spray the plant with the soap completely. In order for the insecticide to be effective, all infested parts of the vegetable plant must be hit with it.

Step 4

Wait three hours and then wash the insect spray off the plants with a garden hose.

Things You'll Need

  • Liquid soap
  • Spray bottle


  • New Mexico State University: Organic Gardening, Natural Insecticides
  • Oregon State University: Using Home Remedies to Control Garden Pests
  • Southern Nevada Water Authority: Pest Control
  • Washington State University Extension: Guides for Insecticidal Soap
Keywords: make insecticide, make homemade insecticide, organic vegetable insecticide

About this Author

Victoria Hunter, a former broadcaster and real estate agent, has provided audio and written services to both small businesses and large corporations, worldwide. Hunter is a freelance writer specializing in the real estate industry. She devotes her spare time to her other passions: gardening and cooking. Hunter holds a Bachelor of Arts in English/creative writing.