Rodenticides can be classified generally as anticoagulants or non-anticoagulants. Most rodenticides are in the anticoagulant group, and among these another classification can be made between the earliest, “first generation”, active ingredients and others that have been discovered and commercialized more recently. First generation rodenticide active ingredients typically require multiple feedings by a rodent to get a lethal dose. Second generation active ingredients, or so-called “single dose” products can be lethal with a single feeding.
As a practical matter all rodenticides are more effective with multiple feedings, and in most baiting programs the target rodents do feed multiple times. Rodenticide active ingredients also have limitations in how they can be attractive to rodents. Usually multiple pest management tactics, and sometimes more than one rodenticide will need to be integrated to achieve a total solution to a rodent problem.
Good Management Practices and Industry Sanitation Standards generally dictate that rodenticide use at food plants be limited to bait blocks secured on rods in an anchored & secure bait station outdoors. Other formulations such as pellets, place packs, liquid baits or tracking powders can be valuable tools, but consideration must be given to where they are used.