Arable News

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Essential autumn weed control advice

Effective autumnprogrammes can tackle grass weed menace


Theopen autumn is helping farmers face the challenge of controlling grass weeds,especially black-grass, in winter wheat. Careful choice of herbicide programmes and timing this autumn cansignificantly help bring populations under control, says Dow AgroSciences.


Thelegacy of the 2013 harvest season has been a massive burden of grass weeds,especially black-grass, explains Dow AgroSciences cereal herbicide specialistStuart Jackson.  Many treatments werenot applied last season allowing grass-weeds to thrive. Now conditions aremoving in farmers favour.


Whenit comes to black-grass, the good news is that dormancy is low and the openautumn has allowed many farmers to reap the benefits of stale seedbeds to burnoff early flushes of the weed. Crops are being drilled into good seedbeds thatare suited to effective early control from pre-emergence treatments.


Allthis adds up to an ideal season in which to optimise the performance of thepost-emergence herbicides, says Mr Jackson.


Autumnapplications are proven to be the most effective at controlling black-grass andother grass weeds. In Dow AgroSciences trials, the levels of control are farhigher from autumn treatments compared to spring applications.


Giventhe open autumn, conditions are ideal for application of post-emergencetreatments such as UNITE (pyroxsulam + flupyrsulfuron-methyl-sodium). Theproduct, proven over three seasons of use delivers both contact and residualaction against key grass weeds and an extensive range of broad leaved weeds.


Basedon several years trials, Dow AgroSciences recommends the application of UNITEwhen black-grass is actively growing at the 1-3 true leaf stage. The applicationshould be made in a mix or sequence with a further residual product such aspendimethalin, flufenacet or prosulfocarb).


Theresidual partner should be chosen according to knowledge of the field and thegrass weed burden, says Mr Jackson.


UNITEoffers effective control of black-grass, wild oats, ryegrasses, bromes, silkybent and annual meadow grass.


UNITEbrings additional benefits compared to other grass weed herbicides, inparticular an extended range of broad leaved weed control including pansy,speedwell, cranesbill, cleavers, charlock, volunteer oilseed rape, volunteerbeans and groundsel.


Thebenefits of UNITE extend beyond the current season. There are no following cropor cultivation restrictions and trials have shown an outstanding level of cropsafety in winter wheat.


Forthe coming season, UNITE can be used on rye and triticale, as well as winterwheat. Only one application, with a maximum dose of 270g ai/ha can be usedbefore growth stage BBCH13 and no later than 31 December in year ofsowing. 


Autumn applicationof BROADWAY STAR is best option for brome control


Thisautumn farmers can tackle the threats of bromes, wild oats and ryegrasses inwinter wheat crops, according to Dow AgroSciences.


BROADWAYSTAR (pyroxsulam + florasulam) has proved the most effective treatment againststerile brome, wild oats and ryegrass over several years of trials andpractical experience.


Whenit comes to controlling bromes, especially sterile brome, the control fromautumn treatment stands out, says Dow AgroSciences cereal herbicide specialistStuart Jackson.


Theideal programme begins with a pre-emergence application of a residualherbicide. Then BROADWAY STAR should be applied as a post-emergence treatmentto actively growing weeds at the 1-3 true leaf stage. Optimal results can beachieved by applying with pendimethalin to prolong the residual activity.


Inaddition to effective control of grass weeds, BROADWAY STAR delivers effectivecontrol against a very wide range of broad leaved weeds a definite bonuscompared to other grass weed herbicides.


Thebenefits of BROADWAY STAR extend beyond the current season. There are nofollowing crop or cultivation restrictions and trials have shown an outstandinglevel of crop safety in winter wheat.


SPITFIRE set to attack onslaught of volunteer beans


An increased area of beans sown last harvest year will pose a threat to cereal crops for harvest 2014 unless an early start is made to control volunteers, warns Dow AgroSciences.


Volunteer beans can grow away quickly and challenge emerging cereal crops, says Stuart Jackson, cereal herbicide specialist at Dow AgroSciences. SPITFIRE, a formulation of florasulam and fluroxypyr tailored for UK conditions, offers effective control of a wide range of broad leaved weeds in winter cereals including volunteer beans, peas and oilseed rape.


SPITFIRE should be applied from GS13 in winter wheat and barley at rates from 0.5 litre/ha. For larger weeds, Dow AgroSciences recommends a 0.75 litre/ha rate with the addition of an approved adjuvant to control beans up to the six emerged true leaf.


SPITFIRE offers extreme flexibility to growers. It can be used in the autumn in mixture with a very wide range of autumn graminicides, autumn residuals and BYDV insecticides. It can be used from autumn right through to late spring and can be followed by more florasulam-based products to complete broad leaved weed control in the spring.


Early control of broad leaved weeds is an important step in the overall battle to protect yield potential and SPITFIRE is the ideal product to launch the campaign, says Mr Jackson.



  • Written by: Farmers Guide
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