1995, William Olkowski, The Gardener's Guide to Common-sense Pest Control→ISBN, page 77:
The only elemental inorganic pesticides still in wide use today are arsenic, boron, copper and sulfur. […] Sulfur is used as a pesticide both in its elemental form and as an important component of other pesticide compounds.
2014, Engineering Genesis: Ethics of Genetic Engineering→ISBN, page 47:
However, in field trials, this weakened version of the virus proved much less effective as a pesticide than the wild type.