Product Profile

Weeds Controlled

Best Use

• For the best and most consistent grass weed control apply Horus at 1.2 L/ha + biopower at 1 L/ha at GS11-13 of the grass weed when the majority have emerged, which on average is in autumn
• Horus used before February should be tank-mixed with an effective residual partner
• Horus applied in the spring or beyond GS21 is more likely to result in sub-optimal application conditions which can significantly reduce profitability through poorer control and/or reduced yields
• Horus 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
• Avoid the use of Horus on a crop of winter wheat treated with, or intended to be treated with, chlorpyrifos as crop damage can occur

Sequences and tank-mixes

• Horus may not be used in sequence or tank-mix with any other grass weed ALS herbicide
• Only one of the following ALS inhibiting herbicides can be applied to the same crop in sequence or in tank-mix with Horus: Chekker, Sekator, Eagle, and only if used in conjunction with a robust non-ALS inhibitor autumn herbicide programme, this is particularly important where both components are applied in the spring
• Do not apply Horus in any non-approved tank-mixes or sequences
• CTU is antagonistic to Horus. The use of CTU as a "holding spray" can reduce Horus efficacy and/or delay application. If you are using CTU, allow the following timings:
  

Grass weed control programmes

Application

• ALWAYS shake well before use
• Always apply with biopower adjuvant at a rate of 1.0 L/ha (but not exceeding 1% of total spray volume)
• Always maintain agitation during mixing and loading and until spraying is complete. Spray immediately. Do not leave the sprayer standing with chemical in it

Cautions

• Application should not be made to frosted, waterlogged or stressed crops
• Avoid application to wet or ice covered leaves as run-off may occur
• Sharp or severe frosts following application may cause crop scorch from which the crop will normally recover
• Crop effects (yellowing) may be observed following treatment, particularly on spray overlaps and for late season/spring applications or where applied to unusually "soft crops". These effects are transitory in nature and will normally have no adverse effect on grain yield

Key aspects of Horus resistance management strategy

• Maximise the use of cultural control techniques such as stale seed beds, delayed drilling, crop rotation and competitive crops
• Use in sequence with effective non-ALS herbicides such 240 g/ha flufenacet (e.g. Liberator 0.6 L/ha)
• Control weeds when they are most vulnerable at 1-3 leaf When using a residual partner, always use an effective at an effective dose
• Never use any other grass weed active ALS inhibiting herbicides in sequence or tank-mix when using Horus
• Monitor weed control effectiveness and investigate any patches of poor grass or broad-leaved weed control. If unexplained, a resistance test may be appropriate