Products used in agriculture and forestry within the group of pesticides used to kill, repel or inhibit insects and their development stages for plant protection. The name is derived from the Latin terms "insecta" (insect) and "caedere" (kill). Insecticides act as contact, feeding or breathing poisons on the insects or their developmental stages (eggs, worms). Insects as pests in viticulture were already controlled in ancient times because, unlike microorganisms, they were visible as enemies of the vine. In many biblical texts and wall paintings there are reports of locust plagues in Egypt in particular. Greeks and Romans fought insects with sulphur mixed with oil and Pliny the Elder (23-79) writes about the use of arsenic. Marco Polo (1254-1324) of China reports the same. From the middle of the 18th century, salts of lead, iron and mercury were increasingly used.