Determination of mosquito repellent activity of extracts from Rosaceae plants
In order to search for effective and environment-friendly plant-derived mosquito repellent materials,this paper studied the effect of soaking on the fresh branches and leaves of 10 Rosaceae plants,such as Cerasus serrulata var.lannesiana,Photinia fraseri and Rosa multiflora,dried at low temperature,the plant extracts were prepared,and the effect of plant extracts on female Culex pipiens pallens was tested by using a laboratory made small flying animal repellent device.The results showed that:except for 3 plants of Photinia serrulata,Amygdalus persica and Pyracantha fortuneana,which had no repellent activity against mosquitoes,the other seven plants had some repellent activity to mosquitoes,the average repellent rate was Photinia davidsoniae(80.95%)>Eriobotrya japonica(79.05%)>Photinia fraseri(76.17%)>R.multiflora(69.70%)>Cerasus serrulata var.lannesiana(68.40%)>Cerasus yedoensis(48.84%)>Prunus cerasifera(43.86%).E.japonica,P.cerasifera and C.yedoensis,had good mosquito repellent activity in the range from 5 to 30 min,and the highest repellent rates were 93.34%,72.22%and 69.23%,respectively,more suitable for short-term mosquito repellent.The repellent rates of R.multiflora,Ph.davidsoniae,Ph.fraseri and C.serrulata var.lannesiana were 94.87%,92.50%,88.57%and 86.79%respectively at 60 min,more suitable for a long time of mosquito rpellent.
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