Which method is NOT effective in reducing resistance to insecticides?

Applying the same insecticide repeatedly is not effective in reducing resistance to insecticides. When practitioners use the same insecticide over and over, it places continuous selective pressure on the pest population. This consistent exposure allows individuals within the pest population that are naturally resistant to that insecticide to survive and reproduce, leading to an overall increase in the proportion of resistant pests. Over time, this can result in a situation where the insecticide becomes ineffective against the target pest, necessitating the need for stronger chemicals or alternative pest management strategies.

In contrast, methods such as the regular rotation of chemical classes, using a variety of application techniques, and monitoring pest populations all contribute positively to resistance management. By rotating chemical classes, for instance, you can reduce the likelihood that pests will adapt to a single mode of action, thereby slowing the development of resistance. Similarly, varied application techniques can disrupt the patterns that pests might exploit, further combating resistance. Monitoring pest populations allows for informed decision-making about when and how to apply insecticides, ensuring effective pest management without excessive reliance on any one treatment that could promote resistance.