Which anticoagulant belongs to the Multiple Dose (1st Generation) category?

The correct answer is Warfarin, which is classified as a 1st Generation anticoagulant in the Multiple Dose category. This means that it requires multiple feedings to achieve effective anticoagulation in the target pest, typically rodents. Warfarin acts by inhibiting the synthesis of vitamin K-dependent clotting factors, which results in a gradual decline in the ability of the blood to clot. This slow-acting nature allows for the anticoagulant to remain in the environment longer, giving pests multiple opportunities to consume it over time, which is pivotal for effective rodent control.

1st Generation anticoagulants, such as Warfarin, have a history of use and are well understood in terms of their efficacy and the behavior of target pests. This contrasts with 2nd Generation anticoagulants, such as Bromadiolone and Difenacoum, which are designed to be more potent and effective in a single feeding.

Recognizing the differences in categories helps pest control operators choose the appropriate rodenticides for their control strategy, ensuring both effectiveness and safety in their applications.