Which amino acid synthesis inhibitor cannot be used during the risk of rain due to runoff?

The correct choice in this question pertains to the characteristics of Plateau, which is an amino acid synthesis inhibitor that can be particularly vulnerable to runoff when it rains. This means that if applied under conditions where there is a potential for rain, the pesticide could wash away, leading to decreased effectiveness and potential environmental concerns.

Plateau is designed to inhibit amino acid synthesis in plants, which makes it effective against certain weed species. However, its chemical properties make it susceptible to being carried away by rainwater, especially if it has not had sufficient time to be absorbed by the target plants. This is a crucial consideration for environmental safety and for effective pest management.

In contrast, the other options may have different chemical properties or application guidelines that allow them to be more stable under wet conditions or less likely to be negatively affected by runoff. Understanding the behavior of different pesticides in relation to weather conditions is essential for responsible and effective pesticide use in right-of-way management and other agricultural practices.