Feature Story

PERENNIAL WEEDS - options for control

As spring turns to summer, it is important to consider weed control while the weather favours plant growth. When targeting nuisance perennial weeds such as docks, nettles and thistles it is important to apply herbicides when the plants are actively growing.

Docks at correct stage for treating

Nettles at correct growth stage for spraying

Thistle at correct growth stage for spraying

Most herbicide applications to silage ground occur prior to or just after first cut. Depending on cutting date, the quality and quantity of silage taken will vary, placing greater importance on achieving the best second cut possible.

Perennial weeds such as docks can significantly affect both the quantity and quality of grass harvested, so well-timed herbicide applications after first cut can reap rewards for the rest of the season and even in to the next spring. To optimise results, wait for 2-3 weeks after cutting for docks to regrow to the rosette stage, then apply Doxstar* to actively growing plants.

Good levels of weed control can also be achieved in grazing leys at this time of year. Where mixed weed populations are present, including docks, nettles and thistles, Pastor* is the most appropriate product to use. Where the weed spectrum is more specific, consider Doxstar* for docks and Thistlex* for thistles.

Treat weeds at the rosette stage, when they are actively growing. If stem extension is already occurring, use a mechanical topper first, and then treat regrowth when it reaches the correct stage.

Summary

Assess remaining weed populations where first cut silage has been taken
Assess weed populations, and plant size, in grazing leys
Where treatment is necessary, make applications at the rosette stage of growth
Weeds must be actively growing to achieve best results
Use Pastor for mixed weed populations
Use Doxstar for docks
Use Thistlex for thistles
7 day stock exclusion period
28 day cutting interval
Excellent grass safety from all products

Keep weeds out of grassland with Dow AgroSciences' excellent range of herbicides.

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