How to Control Japanese Beetles in Large Trees

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    Castor Oil

    • 1). Mix two tablespoons of castor oil with a few cups of water.

    • 2). Place the concoction into a plastic spray bottle.

    • 3). Use this as an insecticide and spray it all over the tree that is infested by the Japanese beetles.

    Kill the Beetles

    • 1). Fill a bucket with dish detergent and water.

    • 2). Collect the beetles with your hands early in the morning when they are less active and easier to grab.

    • 3). Drown the beetles in the soapy water.

    Neem Oil

    • 1). Purchase a product that contains Neem oil. These can be found at most home improvement stores or gardening centers.

    • 2). Spray the Neem oil over the entire tree.

    • 3). Respray the oil as necessary. The Neem oil will not only act as a mild insecticide to kill the Japanese beetles, it will also make the leaves on the tree less attractive as a food source for other beetles.

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