When a pesticide is sprayed and there are still survivorswhat can you assume about them?

When there are survivors after a pesticide is sprayed, it can be assumed that these individuals possess some level of resistance or tolerance to the active ingredient in the pesticide. This resistance may arise from genetic variations that allow them to survive exposure. Additionally, the survivors could have been in microhabitats where the pesticide concentration was lower or they may have behaviors that enabled them to evade the spray. Over time, these resistant individuals can contribute to a population that may become increasingly difficult to control with the same pesticide.