control of wainaku grass

[MarkD]

As with many substances that might be/are dangerous, dosage is key. Try to minimize your exposure.

Try not to get roundup--especially pure roundup--on your hands. If you are not using a mask when spraying, use more of a stream than a mist.

Breathing in roundup mist is ill-advised. (more likely on windy days) Adding a substance that increases adherence to vegetation (see writers above) probably helps reduce misting.