MDARD Michigan Core Pesticide Applicator Practice Exam

Is it less likely for a pest to develop resistance to a pesticide when using multiple products with different modes of action?

1. True

2. False

3. Only for organic pesticides

4. Resistance is inevitable

The correct answer is: True

Using multiple products with different modes of action greatly reduces the likelihood of a pest developing resistance to a pesticide. This method, often referred to as integrated pest management (IPM), works on the principle that when pests are exposed to various chemicals that operate in different ways, it becomes more challenging for them to adapt or evolve resistance. Each mode of action targets the pest's biology in unique ways, meaning that even if a particular pest starts to develop resistance to one pesticide, it may still be vulnerable to control measures provided by another pesticide. This strategy promotes better long-term pest management and helps maintain the effectiveness of the pesticides being used. It’s also important to note that relying solely on a single pesticide can lead to quicker evolution of resistance, as pests that survive the treatment may pass on their resistant traits to the next generation. Thus, the strategic use of multiple products is a proactive approach to slowing down resistance development in pest populations.