Herbicide formulations and sprayer clean-out are top of mind for many farmers, applicators and retailers because of issues with dicamba herbicides damaging sensitive crops and the trend for larger, more complex sprayers that make herbicide clean-out problematic.
Herbicide formulations and sprayer clean-out are top of mind for many farmers, applicators and retailers because of issues with dicamba herbicides damaging sensitive crops and the trend for larger, more complex sprayers that make herbicide clean-out problematic.
Sprayer clean-out is a major concern with sulfonylurea (SU) herbicides, in particular, due to their very high activity at very low concentrations and the enhanced sensitivity of broadleaf crops to this chemistry’s mode of action. SU herbicides are 10 to 100 times more active than many other herbicides, and some broadleaf crops are 10 to 100 times more sensitive to SUs than to most other chemistries (see list below), according to Ken Carlson, FMC product development manager, herbicides.
Concerns about yield drag to non-target crops were so high when cereals SU herbicides were first introduced that their label directions to this day require multiple full-sprayer-volume rinses with water and ammonia. The labels go so far as to recommend a dedicated sprayer when equipment is being switched between cereals and sensitive crops. No other family of cereals herbicides has this type of language on their standard product labels.
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