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countable and uncountable, plural pesticides
Anything, especially a synthetic substance but also any substance (e.g. sulfur), or virus, bacterium, or other organism, which kills or suppresses the activities of pests. quotations examples
Too much pesticide was applied and then washed from the fields by rains and surface runoff.
2001, David McConnell, The Good Earth: Companion Guide, McGraw-Hill Higher Education, page 1.12
Pesticide and fertilizer use has been recorded since ancient times, […]
2011, Allan S. Felsot, Pesticides and Health: Myths vs. Realities, page 4
Diluted neem oil can be effective as a pesticide and can control various fungal diseases, such as powdery mildew, on animals and plants.
2013, Meg Stout, The Complete Idiot's Guide to Aquaponic Gardening