The most important control method for rodents is

• A. Rodent proofing
• B. Baiting
• C. Trapping
• D. Chemical fumigation

Answer: (A)

Preventing entry and eliminating attractants is the most effective way to control rodents. Rodent-proofing creates a barrier that stops new rodents from getting in, which is the foundation of long-term control. When entry points are sealed and sanitation is improved, there’s far less opportunity for a population to establish, reproduce, and cause damage or carry disease.

Baiting and trapping can help to reduce an existing problem, but they’re reactive and require ongoing effort, time, and sometimes repeated applications. Rodents can avoid bait, spread out through the building, or move to new routes if entrances remain open. Chemical fumigation is a drastic, costly method that is appropriate only in specific situations and involves substantial safety and logistical concerns; it doesn’t address how rodents get in, and it isn’t practical for routine prevention.

So, focusing on rodent-proofing—sealing gaps, installing door sweeps, securing vents, and keeping food stored in sealed containers and trash properly contained—targets the root cause of most infestations and reduces the need for other measures.