proherbicide
A compound that, on administration, must undergo chemical conversion by biochemical (enzymatic), chemical (possibly following an enzymatic step), or physical (e.g. photochemical) activation processes before becoming the pharmacologically active herbicide for which it is a proherbicide.
agrochemical
An agrochemical is a substance that is used in agriculture or horticulture.
herbicide
A substance used to destroy plant pests.
(via quinoxaline herbicide )
pesticide
Strictly, a substance intended to kill pests. In common usage, any substance used for controlling, preventing, or destroying animal, microbiological or plant pests.
(via organonitrogen pesticide )
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