02 June 2015 | Online since 2003



27 February 2014|Arable,Crops,News

Trigger point for broad-leaved weed control in winter oilseed rape


With the mild winter temperatures, many winter oilseed rape crops are forward. Recent wet weather has limited ability to travel and tidy up weeds. This has led to agronomists and growers being concerned about when to treat broad-leaved weeds, cleavers in particular, in oilseed rape this spring.

“Galera, based on clopyralid and picloram, is the main spring-applied herbicide for winter oilseed rape as it controls cleavers, mayweeds, sow-thistles and thistles, all weeds that compete with and interfere with the crop. It can be applied from the 4 leaf stage of the crop up to the point just before flower buds are visible above the crop canopy. Usually its cut off is at the end of March or beginning of April. This year with more advanced crops, its cut-off may be a bit earlier, depending on the weather,” says David Roberts of Dow AgroSciences.

“In practical terms, the trigger point for Galera applications tends to be when crops and weeds start to grow, usually after fertiliser applications,” he says.

He points out that in order to optimise performance, stable air temperatures of at least 6ºC and rising are needed, but preferably 8ºC or higher. “The warmer and more stable conditions are, the better the results. Warm days and cold nights (high diurnal variation) do not suit Galera and weed control, particularly of cleavers, could be reduced. Mayweeds and thistle control is less affected, though.”

“Cleavers are the most aggressive and competitive weed, impacting yield and decreasing percentage oil content. They can also contaminate seed, increasing the risk of admixture and reducing the price/tonne. As well as being visible at flowering, these problem weeds make harvesting much more difficult and more costly. Controlling these weeds in oilseed rape will also minimise seed return across the rotation, helping to reduce the weed burden and herbicide spend in following crops – the life cycle approach,” says David.

“Applied at 0.35 l/ha, Galera is approved for the control of cleavers, mayweeds, creeping thistles and sow-thistle. To get the best results on cleavers, conditions need to be warm before and after application, weeds should be actively growing and less than 150 mm in size. Groundsel is well controlled up to the 6 leaf stage.”

“Farmers plagued with difficult weeds that will impact yield and interfere with harvest will need to have sufficient Galera in their store in readiness for optimum application timings,” he says.

David Roberts also reminds growers of their responsibility of keeping pesticides away from water courses. “Extra care needs to be taken at time of spraying to avoid any contamination of water courses. Choosing the right weather and ground conditions and ensuring the sprayer is operated correctly including forward speed and boom height can significantly reduce spray drift.”

Galera (267 g/L of clopyralid and 67 g/L of picloram formulated as a suspension concentrate) is recommended post-emergence in all varieties of winter oilseed rape for the control of broad-leaved weeds including cleavers, mayweed, sow-thistles and thistles. It can be applied from the 4 leaf stage of the crop up until before flower buds are visible above the crop canopy. It is recommended at a dose rate of 0.35 l/ha and is compatible with a wide range of graminicides, insecticides and fungicides. It is packed in a 1 litre container.


Download




Comments


No comments posted yet. Be the first to post a comment

To post comment without approval login or register

Display name

Please enter your name

Email (optional)
Comment

Please enter your comment

Post Comment

Your comment submitted successfully.Please wait for admin approval.

Some error on your process.Please try one more time.



Jobs


13 July 2015
Job for Harvest/Autumn help in Cambridgeshire
Harvest /Autumn helper required to join small team on well equipped arable farm. Starting July to early October. Must be an e...

1 June 2015
Herdsperson - Permanent job on dairy farm in South Devon
Assistant Farm / Herd Manager Required

 

Our family farm requires an assistant farm / herd manager to join a progress...

17 May 2015
Herdsperson with tractor skills: Job on farm near Market Rasen
We require a herdsman on our 500 acre arable/dairy farm in Lincolnshire. Milking 90 Holsteins through a 10/10 hb parlour, str...

13 July 2015
Experienced tractor driver / general farm worker needed for harvest and autumn drilling work. Job in North Yorkshire. 
Family farm with a 600ha arable enterprise looking for an experienced tractor driver to join our small team of dedi...

19 July 2015
Jobs for Harvest Workers required on large arable operation. Cambridge
Large arable farming business covering 1550 ha is looking for two workers to assist with the harvest operations. 

We...



Top stories you may have missed
15 May 2015 | Arable

Scotland’s Rural Affairs Secretary Richard Lochhead is calling on the Europ...


15 May 2015 | Finance

As the country settles down following the turmoil of the general election, ...


14 May 2015 | Animal Health

New research from the Universities of Bristol and Cambridge has found that ...


13 May 2015 | Animal Health

A new publication to help farmers prevent sheep lameness and offer advice o...


12 May 2015 | Agri Safety

The Farmers’ Union of Wales is putting the spotlight on Liver fluke at next...


5 May 2015 | News

The UK is now third in the global rankings for utility-scale solar energy a...


29 April 2015 | Agri Safety

A recent Rural Watch demonstration and information event gave Farmers’ Unio...


24 April 2015 | Meat Processing

Retailers should confirm their commitments to sourcing UK lamb this season,...


15 April 2015 | Meat Processing

A leading retailer has apologised after selling imported lamb in a Borders ...


9 April 2015 | Finance

The time has come for landlords to expect to see reductions in farm rents, ...