Which would increase the likelihood of pesticide resistance?

The likelihood of pesticide resistance is greatly increased when there is continued use of pesticides from the same chemical class. This is primarily because pests can adapt and become more resilient to a specific pesticide over time. When the same active ingredients are used repeatedly, the selection pressure on the pest population is consistent, allowing individuals with resistance traits to survive and reproduce. As a result, the population shifts towards a greater proportion of resistant pests, making the chemical treatments less effective.

In contrast, using methods such as rotating different pesticides, employing integrated pest management techniques, or alternating biological and chemical control methods can help mitigate the development of resistance. These strategies introduce variability in the control measures being utilized, which can help prevent pests from adjusting to and developing resistance against any one treatment.