For a test, I used marigold seedlings raised indoors in plastic cups, watered with rain water, at a temp of about 65. They were about 2 inches tall. I treated them with Quicksilver, T-Zone, Speedzone, and untreated control. I moved them outside at 39 degrees for treatment and after 30 minutes moved them back inside. Non-ionic wetting agent was included. I tried to use about label rate--but naturally using small hand sprayers this was only approximate.
It was startling to see the "weeds" treated with T-Zone collapse after only 2 hours.
First photo: labels in orange circles are difficult to read. Three on left treated with Speedzone, next 3 are T-Zone, next two are Untreated control, three on far right are Quicksilver.
Second slide is easy to read, but Quicksilver treatment does not appear.