You could apply Sedgehammer as long as the pasture is not used for grazing. Each 1.33 fl oz bottle will treat an acre.
You will use 1 scoop/spoon of SedgeHammer in up to 2 gallons of water per 1000 sq. ft. Water is only the carrier, so you will use whatever amount necessary to adequately disperse the product over that 1000 sq. ft. area.
Sedgehammer Herbicide will control young horsetail under 6 inches or suppress horsetail over 6 inches. Please see pages 2-3 product label for complete instructions. We do not have any products that are labeled for arum italicum because it is a newer invasive species. You can use a non-selective herbicide such as RoundUp QuikPro for this plant.
Sedge Hammer in the 1.33 oz. bottle will make about 40 gallons worth of concentrate.
The 1.33 oz bottle of SedgeHammer Herbicide should be applied with a surfactant and will cover up to an acre of treated area.