What is a key usage restriction for glyphosate?

The key usage restriction for glyphosate involves its application near potable water sources. Specifically, glyphosate should not be applied within a certain distance of a water intake to prevent contamination of drinking water supplies. This regulation is in place because glyphosate is a systemic herbicide, meaning it can move through the environment and potentially enter water systems, leading to risks for human health and aquatic ecosystems. By maintaining a buffer zone of 1/2 mile upstream of potable water intakes, applicators help ensure that the herbicide does not adversely affect water quality and safety.

The other options provided do not reflect the specific usage restrictions associated with glyphosate. Some may be based on misconceptions or misinterpretations of regulations surrounding its use. Understanding the importance of protecting water resources from potential contaminants like glyphosate is essential for responsible pesticide application.