Which herbicides move within the plant and are effective against pests or plant parts that your application methods cannot reach?

• A. Contact Herbicides
• B. Residual Pesticides
• C. Non-Selective Pesticides
• D. Systemic Herbicides

Answer: (D)

Systemic herbicides are absorbed by the plant and moved through its vascular system, so the chemical can reach tissues that you can’t reach with surface application. This translocation allows control of underground parts, roots, or growing points and even whole plants, because the active ingredient travels to where the pest or damage resides. In contrast, a contact herbicide acts only where it touches the plant and does not move inside, residual refers to how long the chemical remains active after application, and non-selective describes the range of plants it can affect rather than how it moves within the plant. So the option describing movement within the plant and effectiveness against parts out of reach is systemic herbicides.