MDARD Michigan Core Pesticide Applicator Practice Exam

What is a benefit of using resistant plant varieties?

1. Increased growth rate in poor conditions

2. Higher pest populations attracted

3. Reduced pest populations below harmful levels

4. Decreased crop yield

The correct answer is: Reduced pest populations below harmful levels

The choice indicating that a benefit of using resistant plant varieties is the reduction of pest populations below harmful levels is accurate because resistant varieties are bred or selected to withstand pest pressures effectively. This genetic resistance means that when pests attack resistant plants, they are less likely to thrive and reproduce, leading to a decrease in pest populations. This not only protects the crop but also contributes to a more stable ecosystem, as there are fewer pests to disrupt the balance of local wildlife. In broader agricultural practices, employing resistant plant varieties can diminish the need for chemical pest control methods, fostering environmentally friendly farming practices. Additionally, when pest levels are maintained below harmful thresholds, crops can achieve better yields and consistent performance. The other options do not align with the benefit of using resistant varieties. While increased growth rates in poor conditions might be a desirable trait, it is not directly related to pest resistance. Higher pest populations would contradict the purpose of employing resistant varieties. Similarly, decreased crop yield would negate the advantages that resistance provides, as successful resistance should correlate with better overall yield and health of the plants.