How to Remove Sooty Mold from Citrus Trees

Sooty mold indicates that your citrus trees have an insect infestation. It is usually found on the bottom of a tree's leaves. The insects that cause sooty mold--mealybugs, whiteflies and aphids--are typically more active during cooler weather. Mold forms from a honeydew secretion that the insects leave after feeding on the tree. You can remove sooty mold with store-bought insecticides or homemade solutions.

Ripe oranges
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Sooty mold may grow on your citrus trees.
Spraying a citrus plantation
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Spray insecticide.

Step 1

Spray both sides of infected tree leaves with Big Buster insecticide. Use a second treatment 10 to 14 days after your first application if your trees have a severe infestation.

Growing tangerines
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Treat the leaves with Gold Copper.

Step 2

Spray your trees with liquid Gold Copper when mold develops. Apply it only to infected leaves. Stop a large outbreak by respraying infected leaves 10 to 14 days after the first treatment.

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Make a homemade insecticide to spray on the leaves.

Step 3

Mix 1 cup of cooking oil with 1/2 cup of water. Place a small amount of dish soap in the mixture, then spray it on the infected leaves. This homemade spray will smother the insects.