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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 76, No. 1, 2016, pp. 71-76
Bioline Code: cj16010
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 76, No. 1, 2016, pp. 71-76

 en Toxicity of essential oils of Piper marginatum check for this species in other resources Jacq. against Tetranychus urticae check for this species in other resources Koch and Neoseiulus californicus check for this species in other resources (McGregor)
Ribeiro, Nicolle; Camara, Claudio & Ramos, Clecio

Abstract

Tetranychus urticae check for this species in other resources Koch (Acari: Tetranychidae) is an economically important pest of agricultural and ornamental crops worldwide. It has been shown that many of natural plant-based pesticides have fewer side effects compared with synthetic chemicals. The essential oils of plants have been broadly studied for pest-control, including toxic and repellent effects, antifeedant, ovicidal, and other properties. Essential oils from stems, flowers, and leaves of Piper marginatum check for this species in other resources Jacq. were evaluated in the laboratory regarding their acaricidal potential against the two-spotted spider mite (T. urticae) and the results were compared with eugenol as a positive control. The oils were also evaluated with regard to the susceptibility of the natural enemy of T. urticae ( Neoseiulus californicus check for this species in other resources McGregor). Based on LC50 estimates, oils from stems and flowers exhibited the same toxicity and differed significantly from the leaf oil with LC50 0.37, 0.56, and 3.77 μL L-1, respectively. None of the oils tested exhibited toxicity greater than or equal to that of the positive control. The oil mortality rate was significantly lower for N. californicus (50% to 70%) than for T. urticae (> 95%). The P. marginatum oils also deterred oviposition. Among the chemical constituents tested, sesquiterpenes were more toxic with an LC50 of 2.89 μL L-1 than phenylpropanoids Z-asarone and E-asarone with LC50 6.64 and 8.51 μL L-1, respectively. The acaricidal properties, oviposition deterrence and selectivity make these oils strong candidates for use as the active ingredient in a plant-based acaricidal agent.

Keywords
Acaricidal activity; chemical constituents; Piperaceae; predator mite; two-spotted spider mite

 
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