Thursday, 19 September 2013

EAMU for SumiMax in winter oats

EAMU for SumiMax in winter oats adds to limited herbicide choice

Winter oats have become one of the success stories of the 2013 harvest and the area grown is predicted to expand this year, bringing in new oat growers.
It is an ideal break crop but being uncompetitive relies on the early removal of grass and broad-leaved weeds for good establishment in the winter. The residual and contact-acting herbicide SumiMax has an Extension of Authorisation for Minor Use (EAMU) for use in winter oats, one of the few herbicides with both grass and broad-leaved weed activity that can be used in this increasingly popular crop.

Winter oats are not only a good break crop, but there is a strong commercial market for them, with increasing consumer demand for more oat-based products. Last year over 122,000 hectares of oats were grown in the UK. In gross margin terms they are competing successfully with second wheats in the rotation and in the latest HGCA Recommended List trials are yielding close to 9t/ha.

Agronomically winter oats should be drilled from mid-September to mid-October, but, with the later harvest, planting may be later this year. Early removal of grass and broad-leaved weeds is advised and SumiMax adds to the restricted range of herbicides with grass-weed and broad-leaved weed activity that can be used in winter oats. A PPO inhibitor, it is a novel herbicide with a different mode of action, which is required in oats where grass-weed resistance can be a problem.

Applied at 100 ml/hectare in a minimum water volume of 200 litres per hectare, SumiMax is applied pre-crop emergence in all varieties of winter oats for the control of annual meadow-grass and a wide range of broad-leaved weeds including charlock, chickweed, cleavers, common field speedwell, common poppy, field pansy, fumitory, groundsel, ivy-leaved speedwell, mayweed and red deadnettle. It can also offer additional benefits on black-grass and rye-grass. In independent trials it has shown good weed control when applied pre-emergence versus flupyrsulfuron-methyl applied early post-emergence.

SumiMax contains 300 gms ai/litre flumioxazin, formulated as a white, non-staining, easy-to-use suspension concentrate, packed in a 500 ml pack. In addition to the EAMU for oats, it is also recommended in winter wheat, where unlike in winter oats, it can be used pre or post-emergence. It also integrates well into black-grass control programmes. It is compatible with a wide range of autumn products, but should not be mixed with any adjuvants, with pendimethalin containing products or with prosulfocarb post-emergence. It can also be sequenced with any product including sulphonylureas, a limited number of which have label recommendations for broad-leaved weeds in oats, but a 14 day interval should be allowed. A proprietary tank cleaner should be used before and after spraying to thoroughly clean all spray equipment, including booms, pumps, filters and lids.

For any EAMU, growers should obtain a copy of the notice of approval via the Chemicals Regulation Directorate (CRD) web site, ADAS offices or NFU. In the EAMU notice of approval, CRD point out that liability lies with the user and growers are advised to test a small area of crop prior to commercial use.

For further comment and information, please contact Stewart Woodhead, Technical Manager, Interfarm UK Ltd. on 01354 741414 or
07557 119592 (mobile) or via e-mail

Winter oats
Use plant protection products safely. Always read the label and product information before use.

Editors Notes - INTERFARM UK Ltd is an affiliate of Sumitomo Chemical Company.
Interfarm UK Ltd., Kingham’s Place, 36 Newgate Street, Doddington, Cambridgeshire PE15 0SR

Tel: 01354 741414  Fax: 01354 741004