How to Make Orange Oil Pesticide

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Peel an orange, and delight in the aroma wafting from the oil locked within the fresh peels. Orange oil has its own delightful surprise, at least for anyone with a garden full of bug-infested plants. Its major component is d-Limonene, a compound now approved by the Environmental Protection Agency as an organic pesticide. Homemade orange oil pesticide has all the potency of the store-bought varieties, at a fraction of the cost.


How Orange Oil Works

Orange oil does to insects the same thing it does to household grease: It dissolves the waxy, water-repellent covering that makes them impervious to many chemical pesticides. Once this layer of protection is gone, the oil suffocates bugs that don't die from fluid loss.

Orange oil kills aphids, spider mites, fire ant workers, fleas and several other yard or garden pests.
Image Credit: Lightwriter1949/iStock/Getty Images


Orange oil works on contact, so spraying insect-infested plants thoroughly is essential, This is especially true for aphids and spider mites that feed in protected areas such as the undersides of leaves.

Things You'll Need

  • Waterproof gloves

  • Protective clothing, including long pants and a long-sleeved shirt

  • Respiratory mask

  • Safety goggles

  • Tablespoon measuring spoon or measuring cup

  • Clean 1-gallon container with cap or lid

  • Orange oil

  • Liquid molasses

  • Water

  • Funnel

  • Clean spray bottle large enough to treat the infested plants

Step 1

Set up the ingredients and equipment in a well-ventilated area.


Step 2

Put on the protective clothing, respiratory mask, safety goggles and waterproof gloves.

Step 3

Measure 4 tablespoons, or 1/4 cup, or orange oil and 2 tablespoons, or 1/8 cup, of liquid molasses into the 1-gallon container.

Step 4

Fill the container with water, seal it and shake it well to mix the ingredients.

Step 5

Funnel the quantity of pesticide you need into a clean spray bottle.



Wearing the protective clothing, gloves, goggles and mask protects you from potential skin, eye or nose an throat irritation while handling the orange oil. If you spill any oil on your clothes, wash them promptly.

To prevent possible burns and foliage damage, apply the orange oil mixture when daytime conditions are not sunny and cooler.


Liquid molasses acts as a buffering agent to stabilize the pesticide's pH and keep it from degrading.

For more information on making organic pesticides, see "How to Make an Organic Pepper Spray for Plants," and "How to Make Garlic Pesticide."