In IPM, chemical control should be used...

In IPM, chemical control should be used...

• A. Always
• B. Never
• C. On a Fixed Schedule
• D. When Pest Populations Exceed Thresholds

Answer: (D)

In IPM, chemical control is used only when pest populations reach a level where they’re likely to cause economic damage. This point is called the action or economic threshold. By regularly monitoring pests, you know when to act. If numbers are below the threshold, you rely on other tactics and natural enemies to keep pests in check, avoiding unnecessary chemical use. When pests exceed the threshold, a targeted, carefully timed chemical treatment may be needed, ideally chosen to minimize harm to beneficials and resistance. Using chemicals on a fixed schedule or always is wasteful and risky, while never using chemicals can allow damage to occur. So, chemicals are applied when pest populations exceed thresholds.

In IPM, chemical control is used only when pest populations reach a level where they’re likely to cause economic damage. This point is called the action or economic threshold. By regularly monitoring pests, you know when to act. If numbers are below the threshold, you rely on other tactics and natural enemies to keep pests in check, avoiding unnecessary chemical use. When pests exceed the threshold, a targeted, carefully timed chemical treatment may be needed, ideally chosen to minimize harm to beneficials and resistance. Using chemicals on a fixed schedule or always is wasteful and risky, while never using chemicals can allow damage to occur. So, chemicals are applied when pest populations exceed thresholds.