What's New in Christmas Tree Weed Control.
The years of cheap and effective residual weed control are now consigned to history with the
departure of atrazine, simazine and diuron.
The options now are to rely on regular applications of glyphosate, which although potentially more
time consuming, is still relatively inexpensive, or consider using one of the established or more
recently introduced residual herbicides.
A summary of the pre emergence annual weed control options for March / early April application is
Product Rate £/ha Over Comments
simazine + diuron 3 + 1 £15 Yes No longer available
Established Residual Pre Emergence Products
propyzamide (Kerb Flo) 1.25 £37 Yes Good on grass plus some annual weeds
metazachlor (Butisan S) 2.5 £50 Yes Most annuals including annual willowherb
pendimethalin (Stomp)* 3.3 £50 Yes Most annuals including cleaver, but not annual
willowherb. Likely to be revoked in 2013
oxidiazon (Ronstar Liquid) 4.0 £100 No Most annuals including annual willowherb.
Some contact action.
napropamide Devrinol) 7.0 £130 Yes Most annuals including annual willowherb
Was to be revoked by EC – but now reprieved
New Options – Residual Action before Weed Emergence
flazasulfuron (Chikara)**** 150gm ? Offlabel approval applied for in Germany
Wide range of grasses and annual broadleaves
Perennials - dandelion, bindweed, buttercup,
sowthistle, clover, and rosebay willowherb
New Options – Mostly Foliar Action for May Use on Small Emerged Weeds
rimsulfuron (Tarot)** 50gm ? Used in Denmark to control emerged annual
broadleaves. Moderate couchgrass control.
carfentrazone-ethyl (Shark) 0.33 ? Small annual broadleaved weeds only, including
New Options – Foliar and Residual Action
diflufenican + glyphosate** 3.0 ? Trade name “Pistol”. Possible February appn.
over trees, or April / May as an inter-row spray
Will control established annual & perennial weeds
flumioxazin (Sumimax)*** 0.1 ? Many annual weeds including annual willowherb.
Contact foliar action on small weeds.
prosulfocarb (Defy)** 5.0 ? Used in Denmark. Useful grass control. Some
foliar contact activity on small weeds
* Current offlabel use
** May currently be used under the long term offlabel arrangements
*** SOLA exists. Download from CR site before use
**** No longer be used under the Long Term Arrangements & no offlabel in UK at time of writing.
If no * then the product has a label recommendation