Post-emergent pesticides are applied after seedlings come up. Which of the following is true?

• A. Applied after seedlings come up
• B. Applied before seedlings emerge
• C. Used only as soil-applied
• D. Only in greenhouse use

Answer: (A)

Post-emergent pesticides are defined by when they are applied—after the plant has emerged from the soil and is growing. That’s why the statement “applied after seedlings come up” is the correct description. The other ideas don’t fit: applying before emergence describes pre-emergent products, which aim to prevent germination or emergence; post-emergents aren’t limited to soil applications since many are sprays directed at the foliage of actively growing plants; and they aren’t restricted to greenhouses—they’re used in fields as well. In practice, you apply post-emergent pesticides to actively growing seedlings or weeds and must follow the label regarding timing, crop tolerance, and environmental conditions to avoid injury and maximize effectiveness.