Most of these baits cause death only after they are fed on for a number of days. The exceptions are baits containing brodifacoum or bromadiolone. These baits can cause death following a single feeding, although the mouse does not die for several days. When rodenticides are used, fresh bait must be available continuously until mice stop feeding. Depending on the number of mice, this may require up to three weeks.
Baits are available in several forms.
Grain baits in a meal or pelleted form are available in small plastic, cellophane, or paper packets. Mice gnaw into the packet to feed on the bait. Block style baits are also very effective for most baiting situations. Proper placement of baits and the distance between placements is important. Space bait placements no farther than 10 feet apart and preferably closer.