Repellency of essential oils and their components to the human body louse, Pediculus humanus humanus.

Citation:

Mumcuoglu KY, Galun R, Bach U, Miller J, Magdassi S. Repellency of essential oils and their components to the human body louse, Pediculus humanus humanus. Entomol. Exp. Appl.Entomologia Experimentalis et Applicata. 1996;78 (3) :309 - 314.

Date Published:

1996///

Abstract:

Five essential oils and nine of their components were compared to di-Et toluamide (DEET) for their repellent activity against the human body louse, Pediculus humanus humanus. The abs. or intrinsic repellency of the compds. was tested by applying the repellent to corduroy patches and comparing them with untreated patches. The most effective repellents were DEET and citronella, whose activity lasted at least 29 days. The activity of rosemary lasted at least 18 days and that of eucalyptus more than 8 days. The repellent activity of the oil components such as citronellal and geraniol lasted more than 15 and 8 days, resp. DEET remained effective at a diln. of 1:32, geraniol at 1:8, citronella at 1:4 and rosemary and citronellal at 1:1. The comparative or std. repellency of the candidate repellents was examd. with the aid of a new screening technique using hairs treated with ammonium bicarbonate which is attractive to lice. Using this technique it could be shown that the repellent activity of citronella and geraniol lasted 2 days and that of rosemary and citronellal for only one day. DEET was active for less than one day. Serial dilns. of these substances also revealed that citronella was the most potent repellent for lice, followed by citronellal, rosemary, geraniol and DEET. The differences however, were not significant. [on SciFinder(R)]

Notes:

CAPLUS AN 1996:283469(Journal)