Pests have become resistant to the pesticide normally applied at a site. Which information should you consider to select an alternative?

• A. MOA and chemical family
• B. Brand name
• C. Color of the product
• D. Market share

Answer: (A)

When pests have become resistant, the key is choosing an alternative based on how the product works and its chemical lineage. The mode of action tells you the pest’s physiological target and how the pesticide disrupts it. Using products with a different mode of action reduces the chance that the pest population will already carry or develop resistance to the new method, helping to overcome the current resistance and slow further resistance development. Knowing the chemical family helps you avoid rotating within the same family, which often shares the same mode of action and resistance risks.

Brand name, color of the product, or market share don’t indicate how the product affects pests or its resistance status, so they’re not useful for selecting an effective alternative. Always check the label for the exact mode of action classification and use guidelines to plan a resistant-management rotation with other actions.