Rye-grass control planning autumn
Posted 9 years ago
01/08/2011
Choose the right pre-emergence herbicide for your grassweed populations
- Know your grass-weed spectrum and resistance status
- Flufenacet is proven to be the best pre-emergence herbicide for rye-grass control
- Use Liberator® at 0.6 L/ha as a pre-emergence in any grass-weed situation.
Apply the pre-emergence herbicide as a true pre-emergence application
- Liberator works best as a true pre-emergence herbicide
- Aim to apply within 48 hours of drilling. DO NOT be tempted to wait for moisture to be present before spraying
- The best pre-emergence performances are from full rates on a fine, firm, consolidated seedbed within 48 hours of drilling
Rothamsted Research suggests
“Weed (Italian rye-grass) control should be focused on autumn rather than spring treatments”
WRAG Guidelines (HGCA Guide 50, 2010)
“Italian rye-grass, like black-grass, is best controlled in the autumn”
Stephen Moss of Rothamsted Research suggests
Italian rye-grass emergence (2006/7)
| Month | % emerged plants |
| October | 80.7% |
| November | 7.4% |
| December | 6.2% |
| January | 2.4% |
| February | 1.2% |
| March | 1.9% |
| April | 0.3% |
A reminder…. Apply Atlantis WG in the autumn when rye-grass is at 1-3 leaf stage. Why?
Protect yield
- Leaving rye-grass uncontrolled throughout the autumn saps yield
- Any later germinators will be less competitive and can be tidied up in the spring
Gives you the best chance of the very best control
- Year after year the most consistent control is achieved by Atlantis WG applied in November
- Poor performance is more typically associated with application dates in March or April rather than autumn
- Small plants are easier to kill
- Control is better going into a cold period than coming out of a cold period
Get the best from a residual partner
- Residual partners for Atlantis WG give a better up-lift in control levels when applied with Atlantis WG in the autumn
Only use recommended tank-mixes
- Complicated tank-mixes can reduce Atlantis WG efficacy and increase risk of crop effects
- Applying Atlantis WG in the autumn reduces demand for tank-mixing making the application more likely to give good control levels and stay crop safe
Table of recommendations for post-em. rye-grass control
