Contact pesticides exert their pesticidal action where?

Contact pesticides exert their pesticidal action specifically where they are placed on a plant. These types of pesticides work by affecting the organisms (such as insects or diseases) that come into direct contact with the pesticide. Unlike systemic pesticides that are absorbed and move throughout the plant, contact pesticides remain on the surface and are effective only at the point of contact. This targeted manner of action means that proper application on the areas where pests are likely to be found is crucial for their effectiveness. Understanding this characteristic helps in strategizing applications for optimal pest control.