Homemade Tree Insect Spray


Insects eat leaves, cause fungus to form and can wreak serious damage on a tree if left untreated. Pesticides are available to kill most insects, but they are difficult to work with and can be dangerous to your health if not cautiously used. You can also purchase an insecticidal soap to remove insects from your trees, but by making your own, especially for a large tree, you can save some money. Test your homemade solution on a small area of your tree, and check in three or four days to be sure the leaves do not burn before proceeding to apply the solution to the entire tree.

Step 1

Mix 3 tablespoons of dishwashing liquid soap for every gallon of water to make an all-purpose insect spray. If this does not kill the insects, mix 5 tablespoons dishwashing liquid soap and 5 tablespoons of vegetable oil for every one gallon of water.

Step 2

Put homemade insect spray in a spray bottle if your tree is small and you can successfully spray the leaves. If your tree is large, put the mixture in a pressurized sprayer, such as one used to clean siding or wood.

Step 3

Spray the tops and undersides of all the leaves with the solution. If using a pressurized sprayer, set on the lowest setting possible to reach the top of the tree without damaging the leaves.

Step 4

Spray the leaves with a hose in three to four hours to rinse off the homemade insect spray. If you notice more insects, reapply the insect spray every three or four days until they are gone.

Things You'll Need

  • Dishwashing liquid soap
  • Vegetable oil
  • Spray bottle
  • Pressurized sprayer


  • Oregon State University Extension: Using Home Remedies to Control Garden Insects

Who Can Help

  • University of Wisconsin: Insect ID
Keywords: homemade insect spray, home remedy pesticide, insecticidal soap, tree care

About this Author

Melissa Lewis has been a professional writer since 2005. Her work has appeared in various online publications. A former elementary classroom teacher and media specialist, Lewis is also a script writer, with a movie script, "Homecoming," she co-wrote currently in production. She holds a Bachelor of Arts in psychology.