What does fungicide mean?
A fungicide is any substance — usually chemical, sometimes biological — designed to destroy fungi or suppress their growth, most commonly to protect crops, ornamental plants, seeds, and harvested produce from fungal diseases such as mildew, rust, blight, and scab. The word belongs to a family of '-cide' terms built from Latin roots, alongside insecticide and herbicide, each targeting a different class of pest. Fungicides appear constantly in agricultural, horticultural, and gardening contexts: farmers may spray a copper-based fungicide on fruit trees before bud break, apply a systemic product that is absorbed into plant tissue, or treat seeds before sowing. The term is technical but widely understood, carrying no strong emotional charge in itself, though debates about intensive farming often give fungicide use an environmental dimension. Its etymology is transparent — Latin fungus ('mushroom, fungus') combined with -caedere ('to kill') — making it a model example of how English builds precise technical vocabulary from classical roots.
nounA chemical substance or biological agent used to kill or inhibit fungi and fungal spores, especially those that damage crops, plants, seeds, or other materials.
- A chemical agent that destroys or inhibits the growth of fungi, especially those harmful to plants or crops.
- More broadly, any preparation (chemical or biological) applied to control fungal disease on surfaces, seeds, materials, or living tissue.
"The orchard was treated with a copper-based fungicide to protect the apple crop from scab."
"Farmers applied a systemic fungicide at the first sign of mildew on the wheat."
"The seedlings were dipped in fungicide before planting to guard against damping-off disease."
The plural is regular and commonly used when referring to multiple products or classes of fungicide.
"Several new fungicides were approved for use on wheat this season."
The same Bordeaux mixture — a slurry of lime and copper sulfate invented by accident in French vineyards in the 1880s — became the world's first widely used fungicide and is still sprayed on crops today.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fungicide
The word fungicide combines the Latin noun fungus, meaning mushroom or fungus, with the suffix -cide, derived from the Latin verb caedere, meaning to cut down or kill. This productive '-cide' pattern gave English a whole family of related coinages, including insecticide, herbicide, pesticide, and even genocide, all formed on the same model. Fungicide emerged as a modern technical coinage, appearing in English during the nineteenth century as agricultural chemistry developed systematic treatments for plant disease, notably following the success of Bordeaux mixture in French vineyards. Its closest cognates are the other '-cide' compounds and the Latin-derived words for fungi themselves, such as fungus and fungoid.
Related word forms
How fungicide is actually used
Fungicide is a technical term used mainly in agricultural, horticultural, gardening, and scientific contexts rather than everyday conversation. It is neutral in connotation, though discussions of heavy fungicide use often carry environmental overtones. The word functions as a compound of 'fungus' + '-cide', following the pattern of insecticide and herbicide.
Easily confused with fungicide
An herbicide kills weeds and unwanted plants, whereas a fungicide targets fungi specifically.
A fumigant is a volatile substance used as vapor or gas to sterilize an area, while a fungicide is applied specifically against fungi.