A Herbicide is for the control of weeds and other plants
Insecticide - for the control of insects
Fungicide - for the control of FUNGI
Nematocide - for the control of parasitic worms
Rodenticide - for the control of rodents
Pesticide Handlers - Refers to individuals who mix, load, apply, or otherwise handle pesticides.

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Other /More definition:
A Herbicide is for the control of weeds and other plants
Insecticide - for the control of insects
Fungicide - for the control of fungi
Nematocide - for the control of parasitic worms
Rodenticide - for the control of rodents
Postemergence - Refers to the timing of pest control operations. Postemergence operations are accomplished during the period subsequent to the emergence of a crop from the soil and must be completed prior to point at which crop growth stage prohibits in-field travel (unless alternative application means - aerial or irrigation-based - are used).