Which name of a pesticide is most often missing from the labeling?

The correct choice is the common name of a pesticide. The common name is often less emphasized on product labels compared to the trade name and the chemical name. Trade names are usually prominent because they are the brand names that consumers recognize and relate to particular products. Meanwhile, the chemical name provides specific details about the active ingredient in scientific terms and is typically included to meet regulatory requirements.

Labels are designed to facilitate easy recognition and understanding for both commercial and residential users, hence making the trade name more visible. The common name, however, might not always be included or emphasized since it is less standardized and varies across different sources. Therefore, while the trade and chemical names are adequately represented to ensure compliance and consumer awareness, the common name can sometimes be omitted from the labeling, leading to confusion among those who rely on it for identification.