An extension of authorisation for minor usefor Avadex Excel 15G (tri-allate) for use on spring wheat has been givento NIAB by the Chemicals Regulation Directorate.
The EAMU is welcome news for growers asspring crops represent a very important non-chemical approach to grass weedmanagement and can be a particularly successful component of black-grassmanagement on farm. Avadex Excel 15G, the granular form of the herbicide, canbe applied pre-emergence of weeds and the spring wheat crop at 15 kg/ha.
Field trials have shown that black-grassemergence can be reduced by 90% by planting spring wheat rather than winterwheat. Black-grass plants in spring crops are also less vigorous than thoseemerging in the autumn, says John Cussans, NIABs weed specialist.
However, for these spring crops to be asuccessful component of grass-weed management through a rotation we cant relyentirely on spring establishment timing. Although there is a reduction ofgrass-weeds in spring crops its not 100%, so growers also need an effectiveand diverse range of herbicides available for use. This EAMU for Avadexgranules in spring wheat is part of NIABs ongoing process to try and ensurethat farmers have as many tools to control grass-weeds in spring crops aspossible.
Dr. Dominic Lamb of Gowan reports that moregrowers are successfully using Avadex Granules in their winter crops and heanticipates an upsurge in usage in spring crops, too.
Avadex adds to the overall control ofdifficult grass-weeds such as black-grass, annual meadow-grass and wild-oats aswell as some common broad-leaved weeds including cleavers, charlock, chickweed,mayweeds and poppy. This EAMU for spring wheat joins the already long list ofspring crops on the Avadex label including spring barley and sugar beet and itsother EAMUs including spring linseed and spring rape, says Dr Lamb.
Spring crops may also become more commonfollowing the introduction of new crop diversification rules as part of CAPreform requiring most farmers to grow at least three crops.