Atlantis WG in March has hefty penalty
By Natalie Reed
21 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.
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“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.”
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