Essential Oils vs Rodents

Fall came in almost 6 weeks ago, in Canada its already starting feel like winter is here; but until it is officially here you have time to sort out your garage or garden shed.

Rodent repellents are chemicals which by taste or odour or possibly by both will prevent animal from feeding or gnawing.  Such substances may be used in protecting an area from rodent infestation  or in protecting

 packaged food, packing materials, electric cables, and other important vulnerable materials.  Mature and healthy house rat, Rattus rattus of both sexes, was exposed to 5, 10, and 20% eucalyptus oil applied as spray in laboratory pens in bichoice tests.  In overall, food consumption was significantly low from treatment side compared to the untreated side indicating significant repellent effect of the oil at all the three concentrations tested.  Repellent effect was not found to differ between the two sexes. Percentage of repellency in both male and female rats was apparently more with daily application of 5 and 10% eucalyptus oil. Present studies reveal the potential of eucalyptus oil in repelling away R. rattus; however, further studies may be conducted to enhance the persistence of repellent effect for longer period of time.

Since eucalyptus oil possesses a wide spectrum of biological activity and is regarded as safer compounds, there have been attempts to commercialize and market the insecticides/repellent products containing eucalyptus oil as such or based upon them. Quwenling is a eucalyptus-based product that has been successfully marketed as an insect-repellent in China [40]. It provides protection against Anopheles mosquitoes parallel to DEET and has, in fact, replaced the widely used synthetic repellent, dimethyl phthalate.  

Since eucalyptus oil possesses a wide spectrum of biological activity and is regarded as a safer compounds, there have been attempts to commercialize and market the insecticides/repellent products containing eucalyptus oil as such or based upon them. Quwenling is a eucalyptus-based product that has been successfully marketed as an insect-repellent in China [40]. It provides protection against Anopheles mosquitoes parallel to DEET and has, in fact, replaced the widely used synthetic repellent, dimethyl phthalate.

The present studies reveal the potential of eucalyptus oil applied as spray in repelling away R. rattus of both sexes. Percent repellency was more when the oil was applied daily and alternatively as compared to when applied once a week indicating low persistence of the repellent effect due to volatile nature of the oil. Further studies may be conducted to prepare formulations of the oil leading to slow release of the oil so as to increase its persistence for a longer period of time.

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