28th February 2007

INT804 – a new wheat herbicide from a new group

Interfarm UK Ltd is developing a new wheat herbicide, INT804 from a new group. Based on the new active ingredient flumioxazin, INT804 is a contact and residual acting herbicide, offering excellent control of a wide range of broad-leaved weeds as well as useful control of annual meadow-grass and black-grass.

“INT804 is a new molecule for the UK market and is from the phenylphthalimide group. It appears to have useful activity from pre-emergence to early post-emergence in winter wheat up to GS14, once the crop has hardened off and has been proven to be safe across a range of varieties. It gives high levels of control of many broad-leaved weeds, including those that are regarded as more difficult to control with current products, as well as offering useful effects on some grass-weeds. In trials when applied early post-emergence at 30 gms a.i./ha, flumioxazin gave 100% control of charlock, chickweed, fumitory, groundsel, field pansy, red deadnettle, ivy-leaved speedwell and mayweed, 99% control of cleavers, common field speedwell and Shepherds purse and 95% control of poppy. It also gave up to 90% control of annual meadow-grass and 65% control of black-grass,” reports Dr. David Stormonth, Technical Manager, Interfarm (UK) Ltd.

“Being a new herbicide group with a different mode of action, INT804 will also make a useful contribution to black-grass control when used in mixes and sequences. Flumioxazin is different from all other products currently in use for weed control and will make a significant contribution to the effective management of grass-weed species which have developed resistance to many chemical groups currently used,” points out Dr. Stormonth.

For further comment and information, please contact Dr. David Stormonth, Technical Manager, Interfarm (UK) Ltd. on 01354 741414 or 07818 036506 (mobile).