Mancozeb is a fungicide with protective action. The active ingredient "mancozeb" is in a subclass of carbamate pesticides called dithiocarbamates.

Dithiocarbamates have a similar action to carbamate insecticides but affect the nervous system through their main metabolite, carbon disulfide. Unfortunately, that also means that Mancozeb is a cholinesterase inhibitor and can affect the human nervous system. It is considered to be carcenogenic.

That does not stop many orchid growers using it to control fungal diseases like rot, blight, rust, fungi and bacteria that cause anthracnose, mildew, black rot, etc.

Mancozeb is marketed under numerous trade names, sometimes with sulphur powder added.