Journal of Economic Entomology (2010) 103, 1293-1298

Jun Han, Byeoung-Ryeol Choi, Sang-Gyeu Lee, Soon Il Kim and Young-Joon Ahn (2010)
Toxicity of plant essential oils to acaricide-susceptible and -resistant Tetranychus urticae (Acari: Tetranychidae) and Neoseiulus californicus (Acari: Phytoseiidae)
Journal of Economic Entomology 103 (4), 1293-1298
Abstract: The toxicity of 10 plant essential oils to adults of acaricide-susceptible, chlorfenapyrresistant (CRT-53), fenpropathrin-resistant (FRT-53), pyridaben-resistant (PRT-53), and abamectinresistant (ART-53) strains of Tetranychus urticae Koch (Acari: Tetranychidae) and to female Neoseiulus californicus McGregor (Acari: Phytoseiidae) was examined using spray or vapor-phase mortality bioassays. In bioassay with the susceptible adults, lemon eucalyptus (19.3 µg/cm³) was the most toxic oil, followed by peppermint, citronella Java, thyme red, caraway seed, clove leaf, and pennyroyal oils (LC₅₀, 20.6-23.7 µg/cm³). The toxicity of these oils was almost identical against adults from either of the susceptible and resistant strains, even though CRT-53, FRT-53, PRT-53, and ART-53 adults exhibited high levels of resistance to chlorfenapyr (resistance ratio [RR], >9,140), fenpropathrin (RR, 94), pyridaben (RR, >390), and abamectin (RR, 85), respectively, Against female N. californicus, lemon eucalyptus (LC₅₀, 21.4 µg/cm³) was the most toxic oil, whereas the LC₅₀ values of the other nine oils ranged from 23.2 to 72.6 µg/cm³. N. californicus was 1-2 times more tolerant than T. urticae to the test essential oils. Thus, these essential oils merit further study as potential acaricides for the control of acaricide-resistant T. urticae populations as fumigants.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Young-Joon Ahn

Research topic(s) for pests/diseases/weeds:
control - general
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus urticae	Apple (Malus)	Korea-South
Neoseiulus californicus (predator)	Tetranychus urticae		Korea-South