What factor can affect the efficacy of a fumigant?

The efficacy of a fumigant is influenced by several critical factors, among which are fumigant concentration, temperature, and exposure time.

Fumigant concentration is essential because a higher concentration typically leads to more effective pest control, as the active ingredients are more abundant in the treatment area. Temperature plays a crucial role because most chemical reactions are temperature-dependent; warmer temperatures may enhance the efficacy of the fumigant, allowing it to penetrate more effectively and act more rapidly on the target pests. Finally, exposure time is vital; the longer the fumigant remains in contact with the pests, the greater the likelihood of its effectiveness in eliminating them.

The other options mention factors that may influence some aspects of pest management or equipment performance, but they do not encompass the comprehensive impact on fumigant efficacy.