Which herbicides are applied late in the growing season to prevent regrowth in spring?

• A. Girding herbicides
• B. Foliar sprays
• C. Bud inhibitor herbicides
• D. Amino acid inhibitor herbicides

Answer: (C)

Bud inhibitor herbicides are specifically designed to be applied late in the growing season to suppress bud development, which in turn prevents regrowth in the spring. These herbicides work by targeting the plant's ability to produce new growth from its buds during the critical fall and early winter periods when the plant is preparing for dormancy. By inhibiting this bud formation, they effectively control perennial weeds and reduce their population for the following season.

In contrast, girding herbicides primarily damage the plant's vascular system, often used earlier in the growing season. Foliar sprays are applied to the leaves of plants for immediate control but do not target bud development specifically and may not provide lasting effects into the next growing season. Amino acid inhibitor herbicides disrupt protein synthesis in plants but usually need to be applied when plants are actively growing, rather than late in the season when the focus shifts to preventing new growth.