What type of weeds does Hydrothol 191 (Endothall) primarily control?

Hydrothol 191, which is an endothall herbicide, is specifically designed to target a range of aquatic plants and algae. It acts as a contact herbicide, meaning it disrupts the cellular functions of the plants upon contact, leading to their death. The compound is effective at controlling both algae and various submerged and floating aquatic plants, making it a versatile option in aquatic weed management.

When considering the types of weeds it primarily controls, the focus on algae and aquatic plants accurately reflects its broad-spectrum effectiveness in aquatic environments. This distinction is crucial, as it helps applicators understand the specific applications and limitations of Hydrothol 191 when managing aquatic infestations. The other choices, while they mention different categories of weeds commonly found in aquatic ecosystems, do not encompass the full range of organisms that Hydrothol 191 effectively targets.