Which is a systematic aquatic herbicide active ingredient?

Triclopyr is recognized as a systematic aquatic herbicide active ingredient because it is designed to be absorbed by plants and translocated throughout their system, targeting specific growth processes. This mode of action enables Triclopyr to effectively control a variety of aquatic plants by interfering with their ability to grow and reproduce.

In contrast, the other components listed operate differently. Glyphosate, while being a systemic herbicide, is primarily used for terrestrial applications and does not carry the same aquatic labeling or effectiveness as Triclopyr. Aminocyclopyrachlor, though a broad-spectrum herbicide, has different applications and is not classified specifically for aquatic environments. Diquat, on the other hand, is a contact herbicide, meaning it works on contact with plant tissue without systemically affecting the plant. This fundamental difference in how these herbicides interact with aquatic flora solidifies Triclopyr's unique position in the category of systematic aquatic herbicides.