Casoron 4G Herbicide does not kill anything actively growing as it is a pre-emergent only. It does not list that it will prevent any type of ivy as it states ivy as tolerable on the label so safe to use over.
The coverage for Casoron 4G Herbicide will vary depending on the weeds you are targeting (annual, perennial or nutsedge). For approved application sites listed on the product label, apply 100-150lbs per acre for annual weeds, 150-200 lbs per acre for perennial weeds and 250lbs per acre for nutsedge.
Casoron 4G Herbicide is a pre-emergent only, so it will not kill any existing plants such as poison oak. The product label indicates that Casoron 4G may injure conifers if applied in a way that contacts the foliage. We recommend that you wear protective clothing, cut the vines, and then treat the fresh cuts with a brush killer such as Fertilome Brush Killer and Stump Killer or RoundUp QuikPro for best results and to reduce risk to the desirable trees.
Casoron 4G Herbicide does not get into the air and effect plants or soil that way. It can prevent things growing in treated soil as it is pre-emergent though. Since it can stay in the soil for at least 1 year, you would need to wait at least one year after application to replant or remove the treated soil and replace with new.
It is recommended that you wait at least four weeks before planting anything in an area treated with Casoron 4G Herbicide.
Casoron 4G Herbicide should not be applied near any young trees (also none that are less than 6 months or inside the dripline). No more than 150 lbs per acre should be applied to lilac and on plantings that are less than one year.
Keep pets and kids out of the area after applying Casoron 4G Herbicide until the area has completely dried. Then it is safe to re-enter.
Per the manufacturer label, Casoron 4G should not be used near any type of conifer trees.
No, Casoron 4G Herbicide is best applied directly to soil with a granule spreader that is calibrated to the product labeled rates per area and then watered in with irrigation or rainfall to create the barrier needed to prevent weeds from emerging.