Strategier til ukrudtsbekæmpelse i sukkerroer

Conclusion

In three trials, strategies for weed control are investigated. This year has in general showed a very good effect of all weed control strategies with Betanal and the main differences in the trials were observed between entries with or without Betanal. The 2023 season was characterized by a very dry and hot early summer. These conditions resulted in decreased efficacy, especially of soil herbicides.
Different strategies have been carried out with and without clomazone (Centium) – the phytotoxic damage from clomazone treatments has been evident again this year – and this has resulted in limited yield losses in the plots that have received clomazone after emergence. On the efficacy part, Centium after emergence seems to be able to increase the effect against fool’s parsley, black nightshade and volunteer oilseed rape.
In this year’s trials, three entries were with triflusulfurone-methyl (Safari) – a significant difference was shown in the efficacy of Safari against fool’s parsley, scentless chamomile and volunteer oilseed rape. A decision was made in November 2023 in the EU to ban the active substance triflusulfurone-methyl, and therefore it remains important to look for alternatives to the herbicide, as season 2024 will be the last with this herbicide.
In treatment lines 14 and 15, two biostimulants have been tested to see if it can help plants against phytotoxic damage from herbicide treatments. In this year’s trials, significantly lower levels of phytotoxic damage have been found in the treatments entries that have received biostimulants compared to a treatment entry that has received the same treatment strategy, but without biostimulants. No yield increase of treatments with biostimulants was measured, despite significantly lower levels of phytotoxic damage.