Factors influencing resistance development include the pest population's frequency of resistance before pesticide application. Which other factor is crucial?

The mode of action of the pesticide used is crucial in influencing resistance development because it determines how the pesticide interacts with the biological processes of the pest. Pesticides with specific modes of action can lead to more rapid development of resistance if the pests have a genetic predisposition to survive against those effects. For example, if a pest can quickly adapt its physiology to negate the effects of a pesticide due to its specific mode of action, it will result in a population that is increasingly resistant over time.

Additionally, when different pesticides with varying modes of action are used in rotation or combinations, they can help manage resistance by targeting multiple pathways in the pest's biology. This can slow down the pest's ability to develop resistance, making it a pivotal factor in integrated pest management strategies. Understanding the mode of action is therefore essential for effective pesticide application and for planning long-term pest control measures.