What is a disadvantage of ground meal baits?

Ground meal baits can indeed be advantageous in certain contexts; however, one notable disadvantage is their tendency to absorb moisture from the environment. This property can lead to the bait becoming moldy. Moldy bait not only loses its effectiveness as a food source for pests but can also produce a foul odor which might deter rodents from consuming it. The degradation of the bait makes it less reliable as a pest control method, potentially leading to reduced efficacy in rodent control efforts.

The other options, while they may present some beneficial traits, do not accurately reflect the disadvantages associated with ground meal baits. For example, while some rodent control methods can indeed show immediate results, ground meal baits typically do not fall into this category since their effects may take time as rodents consume and react to them. Additionally, while ground meal baits can be effective against several species of rodents, they are not universally effective against all species, which contradicts the notion of being "highly effective against all rodent species." Lastly, while costs vary, ground meal baits are often competitively priced, and it's not universally true that they are more expensive than other options. Thus, the focus on their propensity for moisture absorption and consequent mold growth provides a clearer understanding of their