What is the difference between systemic and contact pesticides?

Systemic pesticides are designed to be absorbed by plants and transported throughout their tissues, making them effective against pests that feed on those plants, even if the pests have not come into direct contact with the pesticide. This systemic action allows the pesticide to work from within the plant, effectively targeting any insects or pathogens that consume parts of it. In contrast, contact pesticides are effective upon direct contact with the pest, meaning they must touch the pesticide to be affected. This distinction is crucial for effective pest management strategies, as it influences how and when to apply each type of pesticide for optimal results. Understanding this difference helps applicators choose the right type of pesticide based on the target pest and the specific circumstances of the application.