FLIES

A residual contact insecticide is applied to ceilings and walls down to window-ledge level. Sheltered areas at front and back doors are also treated.

This pyrethrin treatment should kill most insects crawling on it for up to 12 weeks. (Don't believe the reports of it still working up to a year after application. Those insecticides were banned over 30 years ago.)

This treatment has a12 week warranty except when temperature and humidity are high as these conditions lessen the effect of insecticides.

If temperature and humidity are low and flies are not dying, it is possible that there is resistance to the insecticide in use. That being the case, we would arrange to re-treat with a different insecticide.