AmTide MSM 60 DF Herbicide would be safe in cool weather when used as directed on the product label, alhough it is most effective applied when weeds are actively growing and healthy.
No, Amtide MSM 60 DF Herbicide is not labeled for catchweed bedstraw. We would recommend using a pre-emergent product to control this weed, such as OH2 Ornamental Herbicide. This can be applied in early spring or early fall.
On page 38 of the AmTide MSM 60DF Herbicide label, it states to use 1oz per acre for treating WhiteTop. Without knowing how big the area is you want to treat and how much water it takes to cover that area, we are not able to give specific mixing rates. Example: If your treatment area is 1/3 of an acre and it takes 3 gallons of water to cover that whole area, you would use 1/3oz of AmTide MSM 60 DF Herbcide as you indicated. Please refer to the label for mixing instructions or contact us directly at 1-866-581-7378 Mon - Fri 9am -5pm EST.
AmTide MSM 60 DF Herbicide is labeled for bur buttercup when used as directed on the product label.