What practice helps ensure pesticides are used only when pests are present on ornamentals?

• A. Scouting with proper identification keys, extension resources, and confirming pest above threshold; avoid spray if not pests.
• B. Spraying on a fixed calendar regardless of pest presence.
• C. Applying pesticides after seeing any damage without identification.
• D. Using the most toxic pesticide first.

Answer: (A)

The approach shown emphasizes monitoring and accurate identification to guide pesticide use, spraying only when pests are actually present above a defined threshold. This reflects a disciplined, evidence-based way to protect ornamentals without overusing chemicals.

Scouting involves regularly checking plants for pests and signs of damage, then using proper identification keys or extension resources to confirm what is actually present. Correct ID matters because many insects, mites, or diseases can look similar, and mistaking a beneficial organism or a harmless issue for a pest can lead to unnecessary or even harmful sprays.

Once pests are confirmed, you compare their level to an action (or economic) threshold—the pest density at which management is needed to prevent economic loss. If the threshold is not reached, it’s best to hold off on treatment or consider non-chemical options. If the threshold is exceeded, then apply the most appropriate, least risky control.

This method protects beneficial organisms, reduces residue and environmental impact, and helps prevent pesticide resistance. In contrast, spraying on a fixed calendar, reacting only to damage after it’s visible, or using the most toxic product first can waste resources, harm non-targets, and undermine long-term control.