What type of insecticide is best for controlling plant lice?

The best choice for controlling plant lice, commonly known as aphids, is systemic insecticides. Systemic insecticides are absorbed by the plant and transported throughout its tissues, providing protection not just on the surface but also within the plant itself. When aphids feed on the plant sap, they ingest the insecticide along with the sap, which effectively controls the population.

This method is particularly effective for aphid control since these pests often reside on the undersides of leaves and in places that may be difficult to reach with contact insecticides. While contact insecticides can kill pests that they directly hit, they may not be effective against those hidden in protected areas, as they require direct exposure to the application. Insecticides categorized as biological may use natural predators or pathogens to control pests but might not provide immediate or widespread control like systemics. Repellents may deter pests but won't necessarily kill them or eliminate an existing infestation like systemic options can. Therefore, systemic insecticides offer the most effective and comprehensive solution for managing plant lice infestations.