What substance can be used to drive cockroaches from hiding when surveying for them?

Pyrethrum is a natural insecticide derived from the flowers of the chrysanthemum plant, specifically Chrysanthemum cinerariifolium. It is known for its effectiveness in repelling and killing a variety of insects, including cockroaches. When using pyrethrum, the active compounds work quickly to affect the nervous system of insects, prompting them to leave their hiding spots as they react to the chemicals in their environment.

In a surveying context, the volatility and rapid action of pyrethrum make it an effective tool for driving cockroaches out from their concealed areas, enhancing the chances of visual identification or trapping. Its use allows pest control personnel to locate the infestations more effectively, facilitating targeted control measures.

In contrast, the other substances mentioned may not have the same immediate effect of driving cockroaches out of hiding. D-phenothrin, while it is an insecticide, may not be as effective in flushing cockroaches out as pyrethrum is known to be. Insect repellents are formulated to keep insects away rather than to coax them out, and soap solutions primarily work to suffocate insects on contact, rather than driving them out from their hiding spots. Thus, pyrethrum stands out as the preferred