Dan from Emigrant,mt writes
Yes, Cy-Kick CS can be used outdoors to kill cluster flies. It is recommended that you apply the product in cracks and crevices where the pest may harbor or hibernate. Do not repeat applications more than twice a week. Treatments need to be done at least 3 days apart. The mixing ratio is 1-2 fl. oz. per gallon of water.
Answer last updated on: 04/09/2018