Which statement defines basal application?

• A. Applying herbicide to the lower 12-24 inches of the stem
• B. Applying herbicide to the foliage
• C. Applying herbicide to the roots
• D. Applying herbicide to the soil surface

Answer: (A)

Basal application means delivering herbicide to the base of the plant, targeting the lower portion of the stem from the soil line up to about 12–24 inches. The chemical is absorbed through the bark and into the plant’s vascular system, allowing the whole plant to be killed without spraying the leaves. This method is especially useful for woody or perennial weeds and helps minimize spray drift to nearby vegetation.

Foliage treatment targets the leaves, which is not what basal application does. Root or soil-surface methods involve uptake through the roots or soil, respectively, not through the stem, which is the defining feature of basal application.