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How to Kill Aphids on Tomato Plants

By Alicia Bodine ; Updated September 21, 2017
Aphids can destroy tomato plants.
tomato plants image by JLycke from Fotolia.com

Tomato plants are susceptible to several different types of pests and diseases. One of those pests is called an aphid. Aphids are tiny sap suckers that drain the leaves of a tomato plant of its necessary fluids. You can identify aphids by their pear-shaped bodies. These pests are 1/8 inch long and often black, brown, or green. You can get rid of the aphids on your tomato plants with soapy water.

Hose down your tomato plants once each morning. Make sure the water isn't coming out too forcefully, or it could damage the plants. Spraying the tomato plants will wash the aphids off. This will work if you only have a few aphids to deal with.

Pour water into a small bucket.

Add dish soap to the bucket of water. The dish soap must be plain. That means it needs to be free of a degreaser or antibacterial agent.

Mix the two ingredients together. Pour some of the soapy water into an empty spray bottle.

Spray your tomato plants with the soapy water. This will kill any aphids on the tomato plant and keep new aphids away. Repeat once every other week, or after a heavy rainfall.


Things You Will Need

  • Garden hose
  • Small bucket
  • 2 Tbsp. plain dish soap
  • 1 gallon water
  • Spray bottle


  • You can save your soapy dish water and use that on your tomato plants.


  • Insecticides are dangerous for humans and pets. If you insist on using them to kill the aphids on your tomato plant, go with one that contains the active ingredient malathion.

About the Author


Alicia Bodine has been a professional writer for 13 years. She has produced thousands of articles for online publications such as Demand Studios, GoBankingRates and WiseGeek. Bodine is passionate about gardening, travel, education and finance. She has received awards for being a top content producer.