Post-emergence herbicides are applied after weeds have:

• A. Emerged
• B. Germinated
• C. Flowered
• D. Fruited

Answer: (A)

Post-emergence means applying the herbicide after the weed has emerged from the soil and is visible above ground. At that point the weed has active leaf tissue to absorb the chemical, making control effective. If the weed hasn’t emerged yet, there’s nothing above ground for the herbicide to take up, which is why post-emergence products are not used before emergence. Germination is the initial sprouting underground or at the soil surface, occurring before emergence; flowering and fruiting happen later in the plant’s life. So the timing described here aligns with weeds that have already emerged.