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Atlantis WG in March has hefty penalty (press release)

Cambridge, 20th February 2012



New analysis of trials data shows how delaying applications of Atlantis WG (mesosulfuron + iodosulfuron) can increase yield penalties dramatically.


Trials conducted by Bayer CropScience over several years demonstrate that while percentage black-grass control remains consistent between February and March applications, yield losses rise from 1.3t/ha to 2.1t/ha.


“The trend continues into April but then percentage control drops too,” says product manager Chris Cooksley.  “By this month a further penalty of 0.8t/ha can be seen.  This is an average though – at some trial sites up to 40% of yield was lost by April.”


The warning comes as a return to higher temperatures encourages growth in already forward grass weeds. 


“Clearly it pays to start applications as soon as conditions allow,” he says.  “Weeds compete with crops for light, nutrients and water.  Even when an application of Atlantis has been made, grass weeds continue to steal from the crop for a short period of time.


“This all adds up and by April the ability of the crop to compensate diminishes too.


“An application costs the same whether it is done in February, March or April but the increasing loss of yield means that holding back does not make financial sense even when the reason behind a later application is to catch late emerging weeds.”




20th February


For further information:

Issued by:

Chris Cooksley

Natalie Reed

Bayer CropScience

+44 (0)1223 226615

+44 (0)1608 637805




Find more information at


About Bayer CropScience

Bayer is a global enterprise with core competencies in the fields of health care, nutrition and high-tech materials. Bayer CropScience, a subgroup of Bayer AG with annual sales of EUR 6.830 billion (2010), is one of the world’s leading innovative crop science companies in the areas of crop protection, non-agricultural pest control, seeds and traits. The company offers an outstanding range of products and extensive service backup for modern, sustainable agriculture and for non-agricultural applications. Bayer CropScience has a global workforce of 20,700 and is represented in more than 120 countries. This and further news is available at:


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