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Strains of black grass have developed resistance to many black-grass herbicides, this may lead to poor control. The Weed Resistance Action Group has produced guidelines on avoiding and coping with resistant black-grass. Copies of the guidelines may be obtained from the CPA, your distributor, crop adviser or product manufacturer.

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 herbicides with different modes of action within individual crops.

Apply pre-emergence wherever possible. Apply any post-emergence products/mixes to small, actively growing weeds, especially where high levels of resistance are suspected and to reduce the risk of resistance development.

Monitor fields regularly and investigate reasons for poor control.

 

Seedbed must have a fine, firm tilth.

Clods, especially if larger than 75mm diameter, may reduce the level of weed control and cause seed to be inadequately covered which could result in crop damage. Consolidate loose or cloddy seedbeds before use.

On stony or gravelly soils, crop damage could occur, particularly, if heavy rain follows treatment.

Do not use on soils prone to waterlogging.

Do not soil incorporate.

Do not disturb the soil after SHERMAN has been applied.

SHERMAN may be used on all mineral soil types except when used on Onions and Leeks.

Residual control may be reduced; under prolonged dry conditions, on soils with a high Kd factor, where organic matter exceeds 6% or where ash content is high.

Do not use on soils with more than 10% organic matter.

 

This material should either be removed or evenly incorporated by cultivation, prior to the application of SHERMAN. Organic matter in the soil, including mulches and farmyard manure, can reduce weed control.

For this reason the application of SHERMAN to soils containing in excess of 10% organic matter is not recommended. If it is suspected that the organic matter content of the surface soil has significantly increased, the land should be periodically ploughed to disperse the organic matter in a greater volume of soil.

If in doubt the organic matter content of the soil should be determined by analysis.

Emerged, transplanted or established weeds SHERMAN controls weeds as they germinate.

Emerged or established weeds will not be controlled by SHERMAN used alone. These must be controlled during seedbed/plant-bed preparation by the use of an appropriate approved herbicide.