Black-grass herbicide strategy

Black-grass herbicide strategy

Cultivation method, drill date and soil type all have an impact on when black-grass seeds will germinate. This has implications for your stacking versus sequencing approach and timing of herbicide application.

Where black-grass emerges from affects herbicide performance

Our data shows that where black-grass emerges from (due to cultivation) affects herbicide performance. In autumn 2018, leaving seed on or very close to the surface helped with pre-em control. In this low dormancy year, black-grass seed germinated quickly and the large stack was the best option in a direct drilled situation. Where weeds emerged from deeper, they emerged over time and the sequence showed an advantage over the large stack.However, in the high dormancy year of 2016, seed on the surface germinated over a longer period of time, and there was an advantage to sequencing herbicides, even in the direct drill situation.