Depending on how bad your rose chafer infestation is, you may want to also use an insecticide dust, such as Sevin, to kill on contact. ... Taking the time and actually pulling the rose chafers off of your flowers and using a systemic insecticide as preventative.

What insecticide kills rose chafers?

Pyrethroid pesticides are most effective against the rose chafers but be sure that you're using an option approved for food crops to avoid contamination. You can also try to protect your blossoms and leaves with cheesecloth or floating row cover material since these beetles don't drop into their targets from above.

How do you get rid of rose chafers?

When small numbers are present, pick rose chafers from plants and drop into pails of soapy water to kill them. Check frequently, as new rose chafers can fly into your garden. You can also use a physical barrier, like a cheesecloth or floating row cover.