Agri-Shop Ltd
Farminguk
26 September 2016 | Online since 2003
Briefing Media - FG Classified


23 June 2014 01:45:28 |Arable

Black-grass testing


With black-grass now flowering above wheat crops, it is easy to see where this weed has got the upper hand this season. In the next couple of weeks black-grass will start to shed seed and if growers don’t know the resistance status of their fields, it is well worth sampling black-grass seed to get it tested.
“We are in testing times as weed resistance is getting worse and weed control is becoming more challenging. You need to know what you are dealing with,” says BASF Campaign Manager Sarah Mountford-Smith.
“If you know the resistance status of your fields, it is much easier to come up with an appropriate programme to suit your needs. That may mean spraying off weed patches with glyphosate or spraying off the whole crop to prevent seed return. Or it may be that you need a robust autumn herbicide programme consisting of a number of actives including glyphosate, tri-allate, flufenacet, pendimethalin and DFF.”
“Whatever the solution, you need to know what you are dealing with. Knowing the exact nature of resistance will help support decisions on how to control black-grass using the most appropriate herbicides. Or it could be an early warning sign to a potentially more difficult problem down the line,” warns Sarah.
She also points out testing for black-grass must be carried out correctly and at the right time. “You need to collect black-grass seed when it is ripe. It is ready for sampling when the seeds are brown and fall off the panicle on their own, when you gently brush them with your hand. Don’t force the seeds off the plant and avoid intact seed heads. Sampling normally takes place the 2nd or 3rd week of July and when 10-20% of weed seeds have already shed, but this year seed is likely to be ripe late June.”
There are a few more hints and tips to get this testing right, says Sarah. “Avoid collecting black-grass seed from the edge of the field, but collect a representative sample from across the field, preferably across 2 or 3 tramlines and across an area of 100m. If there are patches of black-grass in the field, sample from each patch and mix the seeds together. Collect a small mug of seed and transfer it into a paper envelope, allowing it to dry for a few days. The seeds will then be ready to send to ADAS for testing.”
Ideally fields should be tested every three years to coincide with a typical 3 year rotation. Understanding the resistance profile of the black-grass population in the field will optimise control measures.
Sarah Mountford –Smith says that a lot of different factors went against us this year when it came to black-grass. “It was an autumn with low weed seed dormancy. In fact we saw the highest levels of black-grass seed germination for 6 years following the hot dry summer of 2013. We were also having to deal with a huge seedbank following two years of high dormancy. On top of that we had a mild winter and increasing resistance challenges. Of the resistance tests we offered farmers last year, 46% of the total samples exhibited resistance to all three mechanisms (enhanced metabolism, ALS target site resistance and ACCase target site resistance). This was up from 41% the year before.”

Download

0 Comment

loginuserlogo
Name

Please enter your name


Email

Please enter your email

Please enter valid email


Comment

Please enter your comment


Post Comment

Your comment has been submitted successfully. Please wait for admin approval.


Comments

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


New Zealand | 26 September 2016
Foreign investment in food raises fears over loss of control

Silver Fern Farms' controversial $260 million deal with Shanghai Maling received the final tick of approval from the government last week, based on its belief the purchase would be a substantial benef...


Denmark | 26 September 2016
Denmark and Malaysia signs agriculture deal

On 22 September Minister for Agriculture & Agro-based Industries, Dato’ Sri Ahmad Shabery Cheek and his Danish counterpart, Minister Esben Lunde Larsen, finally signed the Memorandum of Understanding ...


USA | 26 September 2016
California farmers drilling wells as groundwater limits loom

Farmers in central California are drilling more and deeper wells than ever before to pump water for their fruit orchards and sprawling fields following government imposed limits on surface water. T...


New Zealand | 26 September 2016
Fonterra profits jump 65% despite ongoing challenges in dairy markets

Despite ongoing challenges in the dairy market, Fonterra, the New Zealand-based co-op, has posted a 65% increase in profits for the 2015/2016 financial year. The co-op has seen net profits increase...


Romania | 26 September 2016
Romania may suspend farmland purchases by foreigners for three years

Romania may suspend farmland purchases by foreign individuals and companies for a period of three years if a draft law currently debated in the Parliament is approved. The new bill aims to set stri...



Trending Now

Viewed
Discussed


Top stories you may have missed
FarmingUK
FarmingUK Logo

FarmingUK

Labour will end the badger cull and prioritise ending bovine TB, Shadow Def...


FarmingUK
FarmingUK Logo

FarmingUK

A herd of rare White Park cattle could die out if its owners do not urgentl...


FarmingUK
FarmingUK Logo

FarmingUK

The UK government is "failing" to support farmers in the long-term accordin...


FarmingUK
FarmingUK Logo

FarmingUK

Retailer Co-op has announced that from May 2017 all of its bacon and lamb w...


FarmingUK
FarmingUK Logo

FarmingUK

Over 50 wildlife organisations have compiled a stock-take of all the UK's n...


FarmingUK
FarmingUK Logo

FarmingUK

In the run up to the EU farm ministers meeting the agricultural sector have...


FarmingUK
FarmingUK Logo

FarmingUK

The RPA must iron out a number of problems that still exist with 2015 BPS p...


FarmingUK
FarmingUK Logo

FarmingUK

Tourism businesses in the countryside are being held back due to the uncert...


FarmingUK
FarmingUK Logo

FarmingUK

A 24 point action plan aimed at revitalising Scotland's sheep sector after ...


FarmingUK
FarmingUK Logo

FarmingUK

A new survey has revealed that the vast majority of British consumers belie...


closeicon
Username
Password