There is provided a process for treatment of rhinitis by diode laser ablation of the posterior nasal nerves. The laser diode delivery device with elongated optic tip is inserted through a patient's nostril and has the length, flexibility and a curvature to reach both above and under the patient's middle turbinate for treatment to both posterior nasal nerves. Skin and tissue temperature is raised to approximately 60-65° C. with the process. Optimal treatment wavelength was found to be approximately 380-450 nanometers with blue lasers.