In this final part in our four-part sponsored series addressing farmers’ concerns about using herbicides, we look at how correct spraying can help achieve high levels of weed control.
Modern grassland herbicides are formulated to deliver high levels of weed control and the product label gives guidance on the level to expect; 85-100 per cent of weeds marked ‘susceptible’ will die after treatment, while 75-85 per cent of ‘moderately susceptible’ weeds will be killed. There are guidelines to follow to achieve this level of success:
For example, where the predominant weeds are docks, use Doxstar®Pro; for Thistles, use Thistlex® (see panel). Select a product where the target weed is susceptible so you are more likely to achieve a lasting result from one spray.
The rates have been worked out meticulously to deliver high levels of control. These perennial weeds have large root systems so the full rate is needed. Also use stated water volumes, unless air inclusion nozzles are fitted, where water rates can be reduced to 200 litres/hectare.
The label on the bottle has everything an operator needs to know about spraying weeds with the product inside, such as where and how it can be used and the amount of time livestock needs to be taken out of the field.
Count the weeds in a representative five-metre x 7m area. If there are five docks or thistles or fewer, it is more cost-effective to spot treat with a knapsack sprayer using Grazon®Pro. If there are more weeds than this, use an appropriate product and spray with a boom sprayer.
Spray when weather is calm, adhere to restrictions near watercourses and only travel when soil conditions allow. Spray actively growing weeds with fresh leaves which are not diseased and which are about the size of a dinner plate. Watch out for clover, as most perennial broad leaved weed sprays will kill it. If the infestation is bad, spray and re-introduce the clover later
Our customers are looking for ways to cut their costs and growing more grass to feed to livestock, as grazing or conserved forage is a relatively quick and easy way to do this. Getting rid of a 10 per cent infestation of weeds in a field means 10 per cent more grass can grow. Thisis particularly important this year when silage stocks have been wiped out by a cold winter. Dow AgroSciences, now merged with DuPont, and in future to be known as Corteva Agriscience, has provided UK farmers with the widest range of grassland herbicides for many years, and when applied correctly, they do a very good job. I encourage livestock producers to give more consideration to the control of weeds so they can grow great grass now and in the future.
This four-part sponsored series is based on the results of market research carried out to assess farmers’ concerns when using herbicides on grassland. For more information, go to grassbites.co.uk or download the Dow Grassland Weed app.
Use plant protection products safely. Always read the label and product information before use. For further information including warning phrases and symbols refer to the label. Corteva. Agriculture division of DowDuPont. CPC2 Capital Park, Fulbourn, Cambridge CB21 5XE. Tel: +44 (0)1462 457272 Doxstar®Pro contains fluroxypyr and triclopyr. Envy™ contains fluroxypyr and florasulam. Forefront®T contains aminopyralid and triclopyr. Grazon®Pro contains clopyralid and triclopyr. Leystar™ contains fluroxypyr, clopyralid and florasulam. Past Tor agronomy pack contains clopyralid, fluroxypyr and triclopyr. Thistlex® contains clopyralid and triclopyr. For grassland advice, call the technical hotline on 0800 689 8899, or visit www.grassbites.co.uk