Which would increase the likelihood of pesticide resistance?

The choice that would increase the likelihood of pesticide resistance is the continual use of pesticides from the same chemical class. When pesticides from the same chemical class are used repeatedly, it creates a strong selection pressure on the target pest populations. This repeated exposure can lead to the survival and reproduction of individuals that have or develop resistance to that specific chemical class. Over time, as the susceptible individuals are controlled and the resistant ones survive, the proportion of resistant pests within the population increases, making future pest control efforts less effective.

In contrast, an insect that has only one generation per year does not contribute significantly to resistance development because the longer generation time can slow down the rate at which resistance develops. Additionally, applying a pesticide that has little or no residual effect means that the chemical breaks down quickly and does not persist in the environment to affect subsequent pest generations. This reduces the chance for pests to be repeatedly exposed to the same active ingredient. Utilizing integrated pest management strategies incorporates a variety of control methods, reducing the reliance on any single pesticide and helping to mitigate the development of resistance.