I have found that killing the beetles by hand at night works. I have sprayed them with water to prevent them from flying. Then kill them by hand. Also neem oil seems to help. My latest discover is to use a bright flashlight at night, usually around 10:30, against my garden box wall... don't spray with water because you want them to fly. The beetles flock to it like moths and are easy to squash by hand or spray with neem oil. I think I might try the alcohol spray on them against the box since I wouldn't be spraying the plants. An added note of interest.... one night a rattlesnake slithered three inches past my foot!! Yes!! They really are out at night!!!
I have found that killing the beetles by hand at night works. I have sprayed them with water to prevent them from flying. Then kill them by hand. Also neem oil seems to help. My latest discover is to use a bright flashlight at night, usually around 10:30, against my garden box wall... don't spray with water because you want them to fly. The beetles flock to it like moths and are easy to squash by hand or spray with neem oil. I think I might try the alcohol spray on them against the box since I wouldn't be spraying the plants. An added note of interest.... one night a rattlesnake slithered three inches past my foot!! Yes!! They really are out at night!!!