CDC does not recommend using "pure" oil of lemon eucalyptus (essential oil not formulated) as a repellent. It has not undergone similar, validated testing for safety and efficacy and is not registered with EPA as an insect repellent. PROTECTIVE MEASURES AGAINST BED BUGS. Encourage
Oil of lemon eucalyptus extract (also known as p-menthane-3,8-diol, or PMD) is derived from the leaves of lemon eucalyptus trees and chemically synthesized, usually in the form of a spray. The ingredient has earned its mosquito-repelling stripes in two NMSU studies led by Rodriguez.
These are NOT bed bugs but it worked. Probably the most toxic spray I've ever encountered but it worked. And then it was prevention - tea tree oil and eucalyptus mixed with boiling water in a spray bottle. Spray every surface and wipe down.
Essential Oils Fail at Killing Bed Bugs. Although Temprid SC, a synthetic pesticide, killed 100% of the bed bugs on the first day, only 88% of bedbugs in the EcoRaider tests had died by the 5th day. None of the compounds tested acted as repellents to bed bugs in climb-up tests, where the bugs had to walk over a treated area.
For preventing ticks from attaching and biting: A specific 30% lemon eucalyptus oil extract (Citriodiol) has been applied up to three times daily when exposed to tick infested areas.
Lemon Eucalyptus Essential Oil After DEET and picaridin (a synthetic compound recommended by the World Health Organization for protection against mosquito-borne diseases), the EWG recommends essential oil of lemon eucalyptus. (They note that natural lemon eucalyptus oil is not the same as the essential oil of lemon eucalyptus, so be careful.)