Sprays high in pyrethrins will help.
Neem oil sprays will also help. Follow directions.
You can pick them off as they are very slow moving. Immerse in kerosene.
But your best option is to use biological controls such as nematodes or milky spore fungus. The larva live underground as a grub and controls will be much more effective.
Once they are hatched and flying around, control becomes much more difficult.
