Citronella is an effective deterrent to biting insects like mosquitoes and sand flies. Citronella essential oil when used as a spray-on repellent was 98% effective immediately after application. When applied to the skin at 3% concentration citronella was nontoxic and effective at ranges up to 98%. The active compounds in citronella oil for repelling mosquitoes are camphor, eucalyptol, eugenol, linalool, citronellal and citral.
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