John from San Antonio, Tx writes
Grubs Away Insecticide is best applied before insects are active as it can take a few weeks to be completely absorbed by the roots. If applied when insects are already active it can have limited results as it has to be ingested by the insects feeding on the treated areas. We recommend contacting your local cooperative extension office to ask about insecticide timing for the pests in your region to be sure you apply at the optimum time. These offices are an invaluable resource when dealing with pests and most have a master gardener and an entomologist on staff to answer pest insect questions.
Answer last updated on: 10/04/2019