Efficacy of six essential oils using water distillation method, clove (Eugenia caryophyllata
Thunb.), citronella (Cymbopogon nardus Rendle.), litsea (Litsea cubeba (Lour.) Pers.), ginger
(Zingiber officinale Roscoe), kaffir lime (Citrus hystrix DC.) and cinnamon (Cinnamomum
zeylanicum), against mortality of shaft louse (Menopon gallinae) and tropical fowl mite (Ornythonyssus
bursa). The experiment was evaluated by filter contact paper bioassay method. It was found that higher
concentrations of essential oils led to a significant increase in mortality of lice and mites (p <0.05). For
The group tested with all essential oils at concentrations of 0.416 ?g cm-2 and 0.832 ?g cm-2 had 100%
mortality rate of lice. Additionally, the group tested with citronella, ginger, cinnamon and litsea oil at
the concentrations of 0.208 ?g?cm-2 revealed 100, 96.67, 96.67 and 93.33% mortality rate, respectively.
That is more significant effective than clove and kaffir lime oils which had 80.00% mortality rate
(p<0.05). For the mortality of mite, the group tested with all essential oils at the 6.656 ?g cm-2
concentration had 100% mortality rate, while the 3.328 ?g cm-2 concentration of citronella, ginger and
cinnamon oils had no significant different of mortality rate compare with litsea oil (p>0.05) but had
more significant effective than clove oil and kaffir lime (P<0.05). The LC50 value against lice of cloves,
citronella, litsea, ginger, kaffir lime and cinnamon were 0.70, 0.63, 0.67, 0.66, 0.68 and 0.66 ?g.cm-2,
respectively. While LC50 against mite of cloves, citronella, litsea, ginger, kaffir lime and cinnamon
were 6.36, 5.73, 5.88, 5.23, 6.87 and 1.18 ?g.cm-2, respectively. Efficacy test of two essential oil
formulas for extermination of lice in the chickens and mite in the chicken nest at 2% concentration of
the two essential oils was mixed in the ratio of citronella oil: ginger, 30:70 and 50:50, and the number
of lice and mites were counted after 1, 7 and 14 days. Essential oils with a higher proportion of ginger
essential oil are more effective in reducing the number of lice and mite which were similar to group
used Trichlorfon. However, both ratios were significantly lower in the number of lice and mites than
the group which was the essential oil diluent (p <0.05). The effect of both types of essential oil formulas
can reduce the number of lice in the chicken for at least 14 days but reduce the number of mite in the
chicken nests for less than 7 days. However, ginger and citronella oils are alternative herbs that can be used in organic animal production as a substitute for pesticides, which can residue in the environment
and have a negative impact on consumers.