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Weed:Parsley piert 

Rate:Application pre-emergence of weed 1.5 l/ha

Critical Comments:Weed susceptibility rating- S ;

 

(S = Susceptible MS = Moderately Susceptible)

 

Repeated use of herbicides with the same mode of action can increase the risk of strains of weeds developing resistance to these compounds, leading to poor control. In order to minimise the risk, a strategy for preventing and managing such resistance should be adopted. Use products with different modes of action and from different chemical groups in sequence or tankmix, in conjunction with effective cropping rotation and cultivation techniques. In all cases the recommended rate of use should be adhered to. Follow WRAG guidelines.

• Always follow WRAG guidelines for preventing and managing herbicide resistant weeds.

• Maximise the use of cultural control measures wherever possible (e.g. crop rotation, ploughing, stale seedbeds, delayed drilling, etc)

• Use tank mixes or sequences of effective herbicides with different modes of action within individual crops, or successive crops.

• Monitor fields regularly and investigate the reasons for any poor control.

 

Topkat can be used on all varieties of winter oilseed rape.

Topkat may be applied pre or post emergence of the crop but for optimum activity application must be pre emergence or early post-emergence of the weeds.

Pre-crop emergence applications:-

 should be made before the crop seed chits, which in optimum conditions may occur within 48 hours of drilling.

 should only be made on medium and heavy soils (as defined by the ADAS Soil Texture (85) System).

DO NOT USE Topkat pre-crop emergence when any of the following conditions apply:-

 When crop has been broadcast.

 The crop seed has started to germinate (i.e. 48 hours after drilling)

 Seed is not covered with 15 mm of soil;

 When heavy rain is forecast;

 Dry, cloddy or open seedbeds;

 Late drilled crops – as a guide these are crops drilled later than the first week in September in Northern England and Scotland and later than mid-September in the rest of the UK;

 Stony soils, i.e. stones, flints or chalk are readily visible on the soil surface.

Post crop emergence applications can be made in the following circumstances:

 When the majority of the crop has two fully expanded cotyledons and up to the eight true leaf growth stage (GS 18);

 On light, medium and heavy soils (as defined by the ADAS Soil Texture (85) System);

 When seedbed conditions are not ideal for pre-emergence use; When the seed is not covered with 15 mm of soil (as with broadcast crops);

 To light, stony, brashy or gravely soils, particularly if heavy rainfall was forecast for the period following drilling;

 When late-drilled crops are to be treated.

Apply 1.5 litres/hectare Topkat in a recommended water volume of 200 litres per hectare. Qualified recommendation Topkat may be applied at 1.5 l/ha in 100 litres of water per hectare however this recommendation has not been supported by effectiveness or crop safety data.

 

Following or rotational crops must not be planted until four months after the application of Topkat.

Any crop can follow normally harvested winter oilseed rape treated with Topkat. Ploughing is not essential before sowing a following cereal crop, but is required for all other crops.

If in the autumn circumstances lead to the failure of winter oilseed rape treated with Topkat the following crops may be re-drilled:-

After ploughing to 15 cm depth, or equivalent inversion cultivation, winter wheat, winter barley, winter oats and field beans may be sown after a four month interval.

Following a failed crop in the autumn, and after cultivating to a minimum depth of 15 cm, spring wheat, spring barley, spring oats, spring oilseed rape, maize, peas, and beans may be re-drilled in the spring at least four months after application of Topkat.

 

Apply as a MEDIUM spray, as defined by BCPC.

Never prepare more spray solution than is required.

Three quarters fill the tank with clean water and start the agitation. To ensure thorough mixing of the product, invert the container several times before opening. Add the required quantity of Topkat to the spray tank while re-circulating. Add the remainder of the water and continue agitation until spraying is complete.

Rinse empty containers thoroughly, using an integrated pressure rinsing device or by manually rinsing three times. Add washings to tank at time of filling and dispose of container safely.

Wash sprayer thoroughly immediately after use, using clean water and following the sprayer cleaning guidance provided by the equipment manufacturer.