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Cereals Application

Herbicides

With pre-emergence sprays there is only one target – the ground. An even distribution of the spray liquid is the aim. Patchy weed control most usually comes from patchy application, due to the wrong choice of nozzle and drift.

Fine sprays are important for retention on difficult to wet grass weed leaves such as wild oats and black-grass. For a given volume of liquid, when the drop size is halved, the number of drops produced goes up by a factor of eight, and the coverage of a flat area of leaf or ground may be up to four times greater. So where the target is very small, a fine spray will greatly increase the chances of hitting it.

 

Fungicides

Cereals present a tall, thin target. Bigger spray droplets penetrate better into the canopy than fine mist, which is either dragged in by turbulence or drifts away. Typically, a standard fan-jet puts half the spray on the crop at GS30/31, the other half is available for weed control, or is wasted to the ground.  Nozzles can be selected to suit different application targets.

Low drift nozzles have proven very effective and good results from air induction nozzles can be expected. The AMISTAR nozzle has been specifically designed to achieve the best results with fungicide applications – providing the ideal spectrum of droplet sizes. Syngenta cereal fungicides are robust and work well when applied as coarse sprays and at reduced volumes.

 

TimingWater volume (l/ha)*Forward speedBest nozzleReduced drift option
Pre-em herbicides200 l/ha10-12 km/hSee nozzle advice belowSee nozzle advice below
Post-em herbicides100 and above12-14 km/h3D nozzle all forwards or alternating forwards and back3D nozzle (worst case AMISTAR nozzle)
Spring wild oats100 and above12-14 km/h (slow down to 12 km/h for later season wild oats)Standard Flat Fan or AMISTAR nozzles (keep to 50 cmboom height)AMISTAR nozzle
Fungicides T010012-14 km/h3D nozzlesAMISTAR nozzle
Fungicides T1-T210012-14 km/hAMISTAR nozzlesAMISTAR nozzle
Fungicides T310012-14 km/h3D nozzle alternating forwards and backAMISTAR nozzle

*Please refer to the product label for water volumes.  Growers can reduce water volumes as long as they adhere to the HSE/DEFRA Code of Practice for Using Plant Protection Products. Please refer to paragraph 4.6.4, page 81 of the HSE/DEFRA Code of Practice for Using Plant Protection Products.

 

2017 recommended pre-emergence nozzles

NozzleWater volume (l/ha)Pressure (bar)Speed (kph)Drift reduction rating
Perfect spray conditions
3D 83-062002.112N/A
3D 83-052002.110N/A
Compromised spray conditions
Teejet TTI1 10-052002.01090%
Teejet AI/AIC 110-05VP/VS2002.01090%

Ongoing trials work allows us to continually update our best application advice to fit with the changing agronomic and environmental landscape. The Syngenta 3D Nozzles still remain a class leading nozzle for efficacy against grassweeds, however their drift reduction operating pressures are low, therefore in sub optimal conditions, a drift reduction nozzle with higher operating pressures should be used. We have seen that Drift Reduction Nozzles can also offer the same level of controls as the 3D.

If using 3D Nozzles, it is important to choose a nozzle with a larger orifice size which will allow you to apply higher water volumes with coarser droplet to minimise drift.

Click here for more information and advice about pre-emergence application

Best application = best wild oat control

AMISTAR nozzles at 100 l/ha and 12 km/h with 0.5 m boom height is the best way to control oats. Low drift and high efficacy.

Grain £100/t; 10 t/ha yield; 5 plants/m2 = 5% yield reduction; untreated plots had 30 plants/m2

Cereal herbicide application