A field evaluation for two newly developed mosquito repellents.

Objective Effect evaluation for two newly developed mosquito repellents,8-hydroxylcarveol formate(R1)and hydroxycitronellal 1,2-propanediol acetal(R2) were conducted in Yili Xingjiang. Methods Subjects smeared equally with mosquito repellent were exposed outside for hours at the peak time of mosquito activity,the number of being bitten and the shortest effective duration were recorded in a special period of time.Results Repellent R2 showed the best repellent effect against mosquitoes.20% R2 held 100% protection rate within 6 h,and the shortest effective duration of 6 h.20% DEET,however,held 100% protection rate within 3 h,and the shortest effective duration of 4 h.Conclusion Hydroxycitronellal 1,2-propanediol acetal displays exellent repellent effect to mosquitoes,much more powerful than DEET in Yili,Xinjiang.Two newly developed repellents is free from side effect on skin,and convenient for use.These advantages the promising future for practical use.