What ancient method was used in 2500 B.C. to control insect pests?

The ancient method used around 2500 B.C. to control insect pests involved the burning of sulfur. This was a widely recognized practice for its effectiveness against various pests, particularly mites. Sulfur acts as a fumigant and also has fungicidal properties, making it a versatile choice for ancient civilizations attempting to manage pest populations in agricultural settings.

While the other options may represent significant advances or alternative approaches to pest control in later periods, the use of sulfur specifically dates back to this ancient time. Plant-derived insecticides like those from the chrysanthemum or nicotine from tobacco emerged much later in history as agricultural practices evolved and as the study of botany advanced. Therefore, the reference point of 2500 B.C. aligns specifically with the historical use of sulfur for pest control.