Put on protective eyewear and rubber gloves on a day when the wind is calm and the temperatures are between 40 and 90 degrees Fahrenheit.
Pour 1 quart of water in a garden sprayer. Add 4 teaspoons of concentrated insecticidal soap to the water and mix thoroughly. Secure the lid on the garden sprayer.
Spray the snowball bush thoroughly with the insecticidal soap ensuring complete coverage of both the top and underside of the leaves. Repeat the treatment with a fresh solution at weekly or biweekly intervals as needed.
Put on protective eyewear and rubber gloves on a day when the wind is calm and the temperatures are between 40 and 90 degrees Fahrenheit.
Dilute 0.25 to 0.50 fluid ounces of permethrin insecticide in about 6 gallons of water. Pour the diluted insecticide into a clean garden sprayer.
Spray the snowball bush thoroughly with the diluted permethrin solution covering the entire surface of the foliage. Spray the soil directly underneath the snowball bush with the mixture to kill any adult root weevils that may be hiding there during the day.
Repeat the treatment at two to three week intervals with a fresh solution of permethrin insecticide.