Weed Control in Grassland

Control of weeds in grassland is an ongoing issue in most farms and if good control has not been achieved at the reseeding stage, it can become a relentless challenge. Docks in poor grassland can account for up to 60% ground cover and take as much fertility from the ground as grassland.

Docks in silage can affect fermentation and reduce the silage quality. Overall, weeds in grassland compete
for space, light, nutrients and water and are unpalatable to stock. There are also animal health issue associated with weeds, including greater incidence of Orf caused by thistles and the serious threat tolivestock caused by ragwort.

There are some key management tips that can help with weed control, such as avoiding poaching of ground, avoiding spreading large quantities of slurry and regular reseeding. The best control is identifying the weeds that are prevalent in pastures and applying the right product in the right quantities. The following table should help:

Weed Problem Solution Dose Rate Grazing Interval Water Volume
Docks & Chickweed Doxstar 3 L/ha or 1.5 + 1.5 L/ha 7 days 300-400 L/ha
Docks, Thistles, Nettles, Buttercups, Dandelions & Ragworth Forefront 2 L/ha 7 days 200-300 L/ha
Thistle Thistlex 1 L/ha 7 days 200-400 L/ha
Docks, Nettles & Thistles Pastor 4 L/ha or 2 +2 L/ha 7 days 300-400 L/ha

CMPP (Duplosan, Optica) is no longer registered for use on grass.