- 1). Fill the Mason jar approximately three-quarters full with warm water and add four to five drops of dishwashing detergent. Swish around the water so that the water becomes bubbly.
- 2). Examine the leaves of your plants to find Japanese beetles. When you find them, pick them off the leaves with your fingers and drop them into the Mason jar.
- 3). Continue to work until you find no more Japanese beetles. Dispose of the soapy beetle water by flushing the contents down the toilet.
- 4). Repeat steps one through three as often as possible to control the Japanese beetle population in your garden.
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