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Jun Han,Byeoung-Ryeol Choi,Sang-Gyeu Lee,Young-Joon Ahn 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
The toxicity of 10 plant essential oils to adults of acaricide-susceptible, chlorfenapyr-resistant (CRT-53), fenpropathrin-resistant (FRT-53), pyridaben-resistant (PRT-53), and abamectin-resistant (ART-53) strains of Tetranychus urticae Koch and to female Neoseiulus californicus McGregor was examined using spray or vapor-phase mortality bioassays. In bioassay with the susceptible adults, strong toxicity was produced by lemon eucalyptus, peppermint, citronella Java, thyme red, caraway seed, pennyroyal, and clove leaf essential oils (LC50, 0.0193-0.0327 mg/cm3). The toxicity of these essential 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 [resistanc ratio (RR), >9140], fenpropathrin (RR, 94), pyridaben (RR, >390), and abamectin (RR,85), respectively. Against female N. californicus was 1.0 to 1.9 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 because of their lower toxicity to N. californicus.
Haribalan Perumalsamy,Xue Wang,Hye Min Shin,Jun-Ran Kim,Byeoung-Ryeol Choi,Soon-Il Kim,Young-Joon Ahn 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10
This study was conducted to determine the toxicity to adult Myzus persicae (Sulzer) and Aphis gossypii Glover of 88 plant essential oils and six experimental spray formulations containing bitter orange or marjoram oil was examined using the vapor-phase mortality and spray bioassays. Results were compared with those of two conventional insecticides deltamethrin and dichlorvos. As judged by 24 h LC50 values, bitter orange oil (0.0212 and 0.0192 mg/cm3) was the most active material, followed by marjoram, celeryseed, and cypress oils (0.0239-0.0508 and 0.0209-0.0542 mg/cm3). These essential oils were significantly less toxic than dichlorvos, respectively. These essential oils were consistently more toxic to adult M. persicae in closed versus open containers, indicating that toxicity was achieved mainly through the action of vapor. Bitter orange oil and marjoram oil applied as 1% spray provided complete mortality toward two aphid species adults. Reasonable aphid control in greenhouses can be achieved by a spray formulation containing the 1% oil as potential contact-action fumigant.
Yi, Chang Geun,Hieu, Tran Trung,Lee, Si Hyeock,Choi, Byeoung‐,Ryeol,Kwon, Min,Ahn, Young‐,Joon John Wiley Sons, Ltd 2016 Pest Management Science Vol.72 No.6
<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P><I>Plutella xylostella</I> is one of the most serious insect pests of cruciferous crops. This study was conducted to determine the toxicity of 21 constituents from <I>Lavandula angustifolia</I> essential oil (LA‐EO) and another 16 previously known LA‐EO constituents and the toxicity of six experimental spray formulations containing the oil (1–6 g L<SUP>−1</SUP> sprays) to susceptible KS‐PX and pyrethroid‐resistant JJ‐PX <I>P. xylostella</I> larvae, as well as to its endoparasitoid <I>Cotesia glomerata</I> adults.</P><P><B>RESULTS</B></P><P>Linalool and linalool oxide (LC<SUB>50</SUB> = 0.016 mg cm<SUP>−3</SUP>) were the most toxic fumigant compounds and were 10.7‐fold less toxic than dichlorvos to KS‐PX larvae. Either residual or fumigant toxicity of these compounds was almost identical against larvae from either of the two strains. Against <I>C. glomerata</I>, dichlorvos (LC<SUB>50</SUB> = 7 × 10<SUP>−6</SUP> mg cm<SUP>−3</SUP>) was the most toxic insecticide. LA‐EO was ∼1430 times less toxic than dichlorvos. The oil applied as 6 g L<SUP>−1</SUP> spray and emamectin benzoate 21.5 g L<SUP>−1</SUP> emulsifiable concentrate provided 100% mortality against larvae from either of the two strains.</P><P><B>CONCLUSION</B></P><P>Reasonable <I>P. xylostella</I> control in greenhouses can be achieved by a spray formulation containing the 6 g L<SUP>−1</SUP> oil as potential contact‐action fumigant. © 2015 Society of Chemical Industry</P>