What is an indicator of successful pest control through fumigation?

A decrease in pest sightings is a strong indicator of successful pest control through fumigation because it signifies that the fumigation process has effectively reduced the pest population in the treated area. Successful fumigation aims to eradicate or significantly diminish the target pest species, leading to fewer visible signs of infestation such as pests themselves or their damage.

In contrast, an increase in pest population would indicate that fumigation has failed to achieve its intended outcome. Higher pesticide toxicity levels do not necessarily correlate with effective pest control; they could suggest potential dangers and risks rather than successful results. The use of multiple fumigants might be a strategy employed in specific situations to enhance effectiveness, but by itself, it does not confirm the success of pest control. Thus, observing a decrease in pest sightings provides clear evidence of the effectiveness of fumigation efforts.