What is the primary factor that increases the likelihood of pesticide resistance?

• A. Continual use of different pesticides from various chemical families
• B. Continual use of the same pesticides from the same chemical family
• C. Periodic rotation of pesticide types
• D. Application of higher doses of pesticides

Answer: (B)

The primary factor that increases the likelihood of pesticide resistance is the continual use of the same pesticides from the same chemical family. This practice exerts consistent selection pressure on the pest population, allowing those individuals that are naturally resistant to the pesticide to survive and reproduce. Over time, the proportion of resistant pests in the population increases, leading to a situation where the pesticide becomes less effective or ineffective against these pests.

In contrast, using different pesticides from various chemical families, or periodically rotating pesticide types, can help manage and reduce the risk of resistance. This diversity in application means that pests are not continually exposed to the same chemicals, which helps to prevent them from adapting and developing resistance. While applying higher doses of pesticides can temporarily control pest populations, it does not address the underlying issue of resistance development and can lead to environmental concerns and potential harm to non-target organisms. Thus, the practice of continually using the same pesticide from the same chemical family remains the primary risk factor for developing pesticide resistance.