Efecto del aceite esencial de congona en el control de Tetranychus urticae Koch (Acari: Tetranychidae)

Abstract

This research work was carried out in the entomology laboratory of the campus of the Faculty of Agricultural Sciences of the Technical University of Ambato, located in the Cevallos canton, Querochaca sector, Tungurahua province. The objective of the research was to evaluate the efficiency of congona essential oil in the control of Tetranychus urticae. The experimental design used was randomized blocks with 3 repetitions and the results were examined by analysis of variance (ADEVA) and Tukey's significance test at 5%. The factor under study was the essential oil of congona at four different dosages: D1 (2%), D2 (4%), D3 (8%) and D4 (16%), and the control T (0%), the application of the oil was by the aspersion method, in breeding units where 10 female mites were placed. In the analysis of variances for the mortality rate at 24, 48 and 72 hours after the application of the essential oil of congona and for the oviposition of the mites, the data transformation was applied with the formula √𝑥 + 3 and √𝑥 + 1, respectively, due to the high coefficient of variance. Based on the statistical analyzes carried out in the present investigation, it was determined that none of the treatments applied had a statistically significant response for the control of Tetranychus urticae, since there were no data with significant variation when comparing treatments D1, D2, D3 and D4, with the control T in none of the variables proposed in the investigation. The median lethal dose (LD50) could not be calculated either due to the low percentage of mortality presented by the mites.