Introduced in 1969, it is a preëmergent selective dinitroaniline to control annual grasses and broadleaf weeds.

[7] Paarlan was a 69% isopropalin emulsifiable concentrate[5] approved for use on tobacco.

[3] It required soil incorporation due to low solubility, ultraviolet light degradation and high volatilisation, and it may have been registered for white potatoes and tomatoes.

[8] Dow marketed Paarlan to southern culture, with a video advert claiming it "is just as much a part of tobacco country as ham and biscuits are part of breakfast.

"[9] Rats fed diets with large amounts of isopropalin had reduced hemoglobin concentrations, lowered hematocrits, and altered organ weights at the higher doses tested.