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Use of pre-emergence herbicide is key for spring beans


United Kingdom
February 19, 2015

It is very important to encourage good and rapid crop establishment so that spring beans can reach their potential

  • Beans are sensitive to compaction – create good seedbed and soil structure
  • Clod-free seedbed will also aid efficacy of pre-em herbicides
  • Drill to suitable depth (min 3 cm soil cover over seed, can be up to 15-20 cm if ploughed in)
  • Optimum plant density is 20 plants/m2 established
  • Beans are not competitive crops & highly vulnerable to early weed pressure
  • Pre-em herbicide is backbone of weed control - limited post-em options

The increased area of spring beans grown this season as a result of the CAP ‘3-crop’ rule and the value of a spring crop for black-grass control will mean that many new growers may not be aware of the challenges for weed control in the crop. For example, there are very few options for weed control post-crop emergence with Basagran being the only option for broad leaved weed control. Whilst Basagran can provide good weed control, optimum activity does rely on being applied in the correct conditions e.g. bright, warm days when the weeds are actively growing and not too big.

Chart 1

It is therefore vitally important to use pre-emergence herbicides in order to get on top of the weeds early and allow the crop to establish as well as possible. The active pendimethalin (as in Nirvana and Stomp Aqua) provides a key role for both grass and broad leaved weed control in spring beans.

Pendimethalin provides excellent activity against grass weeds such as annual meadow grass and gives the strongest residual herbicide base for black-grass control. Against broad leaved weeds it is particularly strong against poppy, dead nettles, speedwells, chickweed, fumitory and polygonums. Its mode of action (inhibition of microtubule assembly) is classified as being at low risk for resistance development and pendimethalin therefore plays an important role in reducing the risk of ALS resistance development in black-grass, chickweed and poppy. Pendimethalin is available for use in spring beans as either Stomp Aqua or Nirvana.

Stomp Aqua (455 g/l pendimethalin) carries EAMU* approval for use in spring beans. Stomp Aqua is the most concentrated formulation of pendimethalin and its non-staining, easy rinse formulation make it the most efficient and convenient to use pendimethalin formulation. It is often used in tank mix with partners containing actives such as prosulfocarb, linuron and clomazone in order to provide control of weeds such as groundsel and mayweeds.

Active (Product) Comments
Pendimethalin
(Stomp Aqua)
Key base product for grass & broad leaved weed control
+ prosulfocarb Enhances annual meadowgrass control and adds mayweeds, vol OSR
+ clomazone Provides additional activity on cleavers, hedge mustard, fool’s parsley
+ pendimethalin + imazamox
(Nirvana)**
Adds to the pendimethalin base to provide strong residual activity against annual meadowgrass, polygonums, charlock, mayweeds, groundsel

**Note; when mixing Stomp Aqua and Nirvana the maximum total amount of pendimethalin applied in a single application is 1320 g/ha.

Nirvana (250 g/l pendimethalin + 16.7 g/l imazamox) carries full label approval for use in winter and spring beans as well as combining and vining peas. It combines the activity of pendimethalin with imazamox which provides improved control of charlock, volunteer oilseed rape, cleavers, mayweeds and groundsel over pendimethalin alone. (See Chart 1)

Nirvana is the most reliable pre-emergence option in spring beans. Its two complementary modes of action provide good residual activity against the key grass and broad leaved weeds commonly found in spring beans. It can be used either alone or in tank mix with a range of partners. (See Chart 2)

Crop safety, soil type, seedbed and other requirements

  • Ensure seed is fully covered and drilled to a depth of 25mm settled soil
  • Level and consolidate loose, cloddy or open tilth before application
  • Do not apply where the seedbed is stony, rough, cloddy or open, or when heavy rain is forecast
  • Ideally apply within 48 hours of drilling
  • Do not apply once the crop plumule is less than 13mm from the soil surface
  • Oilseed rape or brassicas should not be sown as a following crop
Dose rate guidelines Pre-emergence
4.5 lt/ha

 

  • One shot solution
  • Long-lasting broad spectrum weed control
  • Moderate to high weed populations

 

3.0 lt/ha

 

  • Moderate weed populations
  • General broad leaf weed control
  • As a tank mix partner

 

Chart 2

 

*Extensions of Authorised Use (EAMU) for the above products are ‘off-label’ and are at Growers Risk. Users must ensure that all conditions specified in the Extension of Authorisation for Minor Use are complied with and must be in possession of the Notice of Extension of Use, before use is undertaken. The EAMU can be downloaded at https://secure.pesticides.gov.uk/offlabels/search.asp

For further information, please click here to find your local BASF Agronomy Manager

Centium contains clomazone. Defy contains prosulfocarb. Lingo contains linuron + clomazone. Centium is a registered trademark of FMC Corporation, USA. Defy is a registered trademark of Syngenta. Lingo is a registered trademark of Belchim Crop Protection N.V.



More news from: BASF Crop Protection UK


Website: http://www.agricentre.basf.co.uk/agroportal/uk/en/startpage.html

Published: February 20, 2015

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