Casoron® effective in Spring or Fall applications
Weeds,weeds,weeds – they’re everywhere and keep coming back. Weeds such as common groundsel, oxalis, annual bluegrass, bittercress — to name a few — are the most common and troublesome weeds in nurseries, landscapes, parks etc.
Controlling weeds is a twofold process.
- Using a pre-emergent herbicide; and
- Using a knockdown herbicide for escapees or areas untreated with pre-emergent.
To help with #1,OHP now markets Casoron 4G pre-emergent herbicide. Casoron (Dichlobenil 4%) is an effective herbicide which controls a broad spectrum of both broadleaf and grassy weeds. Casoron has excellent activity on hard-to-control weeds such as field horsetail, groundsel, quackgrass, annual bluegrass, nutsedge, and even young, post-emerged Canada thistle.

Casoron forms an herbicidal vapor barrier in the upper layer of soil when activated by rainfall or irrigation water. Casoron 4G is a small granule that needs to be “watered in after application.” Existing weeds rooted in the vapor barrier soon die off and any weed seeds germinating in or below the barrier are killed when new roots and shoots contact the vapor barrier.
Casoron provides long-term pre-emergent control so a single application in early spring will usually provide seasonlong weed control, preventing weeds from even getting established. Casoron may also be applied in the fall for control or early-breaking weeds in the spring. Nurserymen should make certain Casoron granules do not stick on damp foliage or on trunks, branches, or leaves.
Casoron should not be applied in areas where annuals, bulbs, or herbaceous perennials are planted. For more information on how to use Casoron in your weed control program, contact your local OHP representative. For a copy of the label, MSDS, and Product Information Bulletin (PIB), click here.
Casoron is a registered trademark of Chemtura Corp.
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