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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.

Diquat is synthesized by reaction of 2,2 -bipridyl with di-n-propyl amine (1,9).