Control is not always required, mild infestations do not dramatically harm the host plant species.
Hand-picking of the insects as they appear can maintain rosemary beetle populations at a manageable level. Searching with a flashlight in the dark is ideal as their metallic bodies are easier to spot.
For taller host plant species, it is recommended to place fabric or paper below the infected plant, then tap or shake the host plant to easily collect the beetles underneath.
Pesticides are more effective on adult beetles than their larvae. These are recommended for heavier infestations that are not manageable by hand-picking. Take care with chemical control if the host plants are to be used for cooking.
Some chemical treatments for rosemary beetle include organic insecticides with natural pyrethrins. Several applications may be required for full control.
Synthetic pyrethroid pesticides are also effective, such as deltamethrin or lambda-cyhalothrin.
Do not spray when plants are flowering as this can be extremely harmful to pollinating insects!