Dosage; Mix 2.5 ml of Theeta in one liter of water. Azadirachtin is a useful insecticide as it has low mammalian toxicity, is readily biodegradable, is a natural extract, has a long history of safe use, plus it works primarily as an anti-feed ant, rather than as a biocide. Azadirachtin can be used in both conventional and organic farming.