When does ipm use synthetic chemical pesticides?

as the first control option
only as a last resort
when the pest first appears
when prevention methods are necessary

So IPM (Integrated pest management) is an approach to dealing with pests. It's environmentally friendly by using common sense or the pests's life cycle and actions to keep them away as naturally and least harmful as possible.

Gardens using IPM would only use pesticides as a last resort, B.