Neem oil, extracted from the neem tree, has insecticidal properties that can effectively repel and kill cockroaches. Its active compound, azadirachtin, disrupts cockroach growth, feeding, and reproduction. Neem oil acts as a potent insect repellent, deterring cockroaches from entering homes and infesting areas. It can also be used as an ovicide, eliminating cockroach eggs and preventing further infestations.