What enhances the effectiveness of baits in pest control?

Pheromone attractants significantly enhance the effectiveness of baits in pest control by mimicking the natural scents that pests use for communication. Pheromones can be specifically designed to attract target pests, drawing them to the bait more effectively than traditional methods. This heightened attraction increases the likelihood of ingestion, improving the success rate of pest control measures. By using these chemical signals, the baits can entice pests in a way that aligns with their natural behaviors, ensuring that they are more likely to encounter and consume the bait, ultimately leading to better management of pest populations.

The other options do not provide the same level of targeted attraction. While water solubility can affect how well a bait is distributed, it does not directly influence how effectively it attracts pests. Increased granule size could affect the distribution of the bait but may not have a significant impact on its attractiveness. A heating mechanism is generally not relevant to the effectiveness of bait in attracting pests.