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Summer weeds can rob subsequent crops of soil nitrogen and stored soil water. They can also reduce crop emergence by causing physical and/or chemical interference at seeding time.
Options for control of winter broad leaved weeds, in pastures, is a common inquiry. A fairly reliable method is spray grazing.
Group I herbicides are used for broadleaf summer weed control or selective broadleaf weed control in cereals. Damage can be caused by soil residues, spray contact or vapour drift.
Group F herbicides are registered for selective control of wild radish, wild mustard and wild turnip in cereals, legume crops and legume pastures.
These are pre-emergent herbicides for the control of grasses and some broadleaf weeds in crops. Group D herbicide damage in field peas is rare.
This category contains root pre-emergent Group C herbicides such as simazine and metribuzin that are routinely used in lupins, but damage field peas.
Sulfonlyureas, imidazolamines and sulfonamides are systemic herbicides that are used for pre and/or post emergent grass and/or broadleaf weed control in cereals and are mostly highly toxic to peas.
Glyphosate is a systemic knockdown herbicide that is used extensively for brown fallow, summer weed or pre-seeding weed control, or selective weed control in glyphosate resistant crops.