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Bayer Assist

For friendly informed advice about Bayer CropScience products, please call Bayer Assist free from UK landlines on:

0845 6092266

Alternatively, call us on:
01223 226644

(0900-1715 weekdays)

Factors affecting Atlantis WG performance

Add together scores for those factors appropriate for your own Atlantis WG application. Scores of 5 and above indicate that reduced levels of control are likely.

Best use guidance

• For the best and most consistent grass weed control apply Atlantis WG at 400 g/ha + biopower at 1.0 L/ha at GS12-13 of the grass weed when the majority have emerged, which on average is in the autumn
• Atlantis WG used before February should be tank-mixed with an effective residual partner
• Atlantis WG applied in the spring or beyond GS12-13 is more likely to result in sub-optimal application conditions which can significantly reduce profitability through poorer control and/or reduced yields
• Atlantis WG should be applied to actively growing weeds for maximum efficacy
• When a compromise on application timing has to be made, greater efficacy will be obtained where applications are applied going into a cold period rather than coming out of one
• Use application techniques that ensure good weed coverage and crop penetration using 100-200 L/ha of water and a FINE to MEDIUM spray (BCPC category)

If Atlantis WG application has been delayed until spring (after 31st January) the addition of a residual partner is not required if no further grass weed germination is anticipated AND an effective autumn residual pre- and/or post-emergence non-ALS herbicide programme has been used.

Don't lose out - apply in Autumn!

Data Source: Bayer CropScience 2007 Autumn applied Atlantis WG applied with a residual partner of pendimethalin 2.5 L/ha

Always:

• Follow the Atlantis WG resistance management strategy
• Conduct a Local Environment Risk Assessment for Pesticides (LERAP) assessment or maintain the current statutory buffer zone
• Apply Atlantis WG to actively growing weeds
• Add biopower to the spray mixture
• Use application techniques that ensure good weed coverage and crop penetration using 100-200 L/ha of water and a FINE to MEDIUM spray (BCPC category)
• Allow 2 hours' dry, fine weather following an application of Atlantis before rain is expected
• Allow an interval of 6 weeks after an application of a product containing isoproturon (IPU), chlorotoluron (CTU) or linuron
• Allow an interval of 10 days after an application of Atlantis WG before applying products containing IPU, CTU or linuron
• Thoroughly clean spray equipment immediately after spraying and before use on a non-cereal crop

Avoid:

• Application to wet or ice-covered leaves as run-off may occur
• Drift onto crops and non-target plants outside the target area

DO NOT:

• Apply Atlantis WG as a stand-alone treatment unless after an effective non-ALS autumn herbicide programme
• Apply in sequence or tank-mix with any non-specified ALS inhibitor
• Tank-mix with products containing IPU, CTU, linuron or dicamba
• Tank-mix with products with potential to cause crop damage when associated with an adjuvant
• Apply if rain is imminent i.e. less than 2 hours of fine, dry weather
• Apply to undersown crops or crops to be undersown
• Roll or harrow within 1 week of spraying
• Spray crops under stress, suffering drought, waterlogged, grazed, lacking nutrients or if the soil is compacted
• Treat broadcast crops until they have a well established root system
• Drill crops other than wheat, barley, sugar beet, oilseed rape or field beans in the following cropping year
• Allow the induction bowl system to remain active once all products have been added
• Use trifluralin-based products twice, i.e. as both the pre-emergence herbicide and the residual partner for Atlantis WG, as this will not provide a sufficiently robust treatment in difficult situations

Grass-weed management strategy

The successful management of grass-weeds needs to be a planned, long-term strategy applied across the whole farm. As such, consideration should be given to crop rotations, cultural practices and chemical inputs. The ultimate aim should be to achieve optimum weed control, both now and in the future, but with activities geared to minimising the risk of resistance developing.

• Introducing broad leaved crops into the rotation offers the opportunity to use products with an alternative mode of action so reducing the selection pressure from particular chemical groups.
• Consider a break from continuous autumn cropping and include some spring crops in the rotation. Since the peak germination period for black-grass is in the autumn, it tends to be much less of a problem in the spring.
• Cultivations can play a crucial role. Ploughing shed seed down below 5cm has been shown to dramatically reduce black-grass germination. Burying the trash properly also will favour the activity of residual materials.
• Invest time in preparing a good seed bed. A fine tilth will optimise the performance and can increase the crop safety of any residual herbicides.
• Use of stale seed beds and delaying drilling can encourage a flush of weed seeds prior to planting. Use of a total herbicide can then employ an alternative MOA and reduce the weed burden needing to be controlled in crop.
• Consider using higher seed rates or using high tillering varieties to encourage a competitive crop which will help to suppress the weeds more effectively.
• Application of a robust pre-emergence herbicide can offer useful benefits. Not only can it incorporate products with alternative mode of action into the programme, but also it can 'buy' some time if the sprayer is unable to travel due to poor field conditions.
• Ensure an effective post-emergence black-grass treatment is applied to small, actively growing weeds.

Further Reading:

[Usage guidance]  [Following Crops]   [Control programmes]   [biopower] 
[Resistance management]  [Sequences and tank mixes]