21. They have registered citronella as a weak repellent that protects up to two hours. 22. Citronella bark-control collars are now available.23. Spray repellents and citronella oils offer temporary relief in keeping away these winged vampires. 24. Three wristbands _ two with DEET and one with citronella _ provided no protection. 25. Intercropping should include physical barriers, for citronella roots can take over the field. 26. However, natural citronella oil and its derivatives are preferred by the perfume industry. 27. The Texas doctors suggest instead using a combination product made with citronella as the repellent. 28. Active ingredient : 3.06 percent citronella 29. Scented geraniums, but not the citronella variety, which is best at repelling bugs. 30. Q . A citronella candle was spilled on a concrete apron around my swimming pool.
