Manejo de Eotetranychus lewisi (Acari: Tetranychidae) utilizando extracto etanólico de orégano (Lippia origanoides L.) bajo condiciones de laboratorio

Abstract

The tetranychid mite, Eotetranychus lewisi (Mcgregor) can feed on more than 71 host plant species and has a wide geographic distribution, including Bolivia, Chile, Colombia, Costa Rica, El Salvador, Guatemala, Honduras, Panama, Peru and Ecuador. Due to its importance as a pest, in this study the use of oregano plant extract (Lippia origanoides L.) for the management of Eotetranychus lewisi was evaluated. For this purpose, different doses of the ethanolic extract of oregano (5, 10 and 15%) were used on the mortality rate, oviposition rate and longevity of the females of E. lewisi evaluated at 24, 48 and 72 h after the application under laboratory conditions, using the methodology referred to the rearing units. An increase in the mortality rate was observed as extract concentration increased, being more evident at 24 h after the application of the extract, since the mortality rate was 3.8 times higher with the concentration of 5% of the extract, while with 10 and 15% the rate was 5.5 and 8 times higher than the control treatment. Regarding the oviposition rate, an effect of the concentration was observed, but no variations were detected in the three days of evaluation within the same concentration. Finally, longevity had a reduction of 16.7% when 5% extract was used, while with concentrations of 10 and 15%, longevity was reduced between 46.6 and 49.4% in relation to females of the witness treatment. Based on the results, oregano extract could be included in an integrated management program that leads to a reduction in the use of chemical products.