diquat may be applied as preplanting
treatments for many agronomic crops to eliminate
weeds at or before planting. In addition, these herbicides
may be used in established perennial crops such
as alfalfa, mint, and rhubarb during the dormant cycle.
Similarly, their use in vineyards, orchards, and coffee and
rubber plantations, at times of crop dormancy or using
directed sprays so that only the weed is contacted, are
useful for total weed control measures. Diquat is also used
extensively as an aquatic herbicide to control algae and
submerged and floating aquatic weeds.
