When an insecticide such as Merit is said to have systemic action or systemic properties, it means that the insecticide is taken up by roots or absorbed through the leaves into the plant. Simply put, the grass, shrub or tree that is treated with such a material now contains the material. Merit 0.5G Systemic Granules, Merit 75% concentrate and Acephate are examples of systemic insecticide products used to protect lawns, shrubs, ornamentals from various insect pests such as white grubs, Japanese Beetles, molecrickets and other bugs.
insecticide concentrates are sprayed on the plant where the insecticide material
rests on the leaf or blade surface. A systemic insecticide works from the
inside out instead of only on the exterior surface of the treated
plant. The systemic action of Merit granules gives you two distinct
advantages over conventional granules or sprays.