Systemic insecticides are chemicals that plants absorb through their roots or leaves, distributing the insecticide throughout their tissues. This means that when insects feed on the plant, they ingest the insecticide, which can effectively control pest populations. These insecticides are often used in agriculture and gardening to protect crops from harmful insects. Unlike contact insecticides, which only affect insects that come into direct contact with them, systemic insecticides provide longer-lasting protection. They can target a wide range of pests, including aphids, whiteflies, and beetles, making them a popular choice for managing insect infestations in various settings.