Ciencias Agropecuarias
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Item Variación quetotáxica de Tetranychus urticae koch y Eotetranychus lewisi (Mc Gregor) en tres cultivares en la provincia de Tungurahua(2019-01) Sánchez Fiallos, Macarena Beatriz; Vásquez Freytez, CarlosSpecies belonging to the family Tetranychidae exhibit a wide phenotypic plasticity in response to environmental variations which could lead to misidentifications due to morphological similarity between some species. In this study, chaetotaxy variations of several Tetranychus urticae and Eotetranychus lewisi populations collected in different host plant species and localities from six municipalities from Province of Tungurahua were evaluated. Strawberry, raspberry and white carrot leaves showing symptoms for tetranychid symptoms were sampled in localities from Ambato, Cevallos, Baños, Mocha, Píllaro and Tisaleo. In the laboratory, each sample was examined under a stereoscopy microscopy magnification to select tetranychid mites as morphotypes. Slides for microscopy observation were prepared using PVA medium and stove dried for 4 days. Species identification was made by comparison of aedeagus morphology. In general, idiosomal setae showed wide variation due to effect of host plant species and locality. Principal Component Analysis (PCA) accounted for 82% of variation observed in measured variables in 19 populations. Measured variables separated populations collected from raspberry leaves, independently from mite species, while populations from white carrot and strawberry were not fairly separated. Chaetotaxy variables showed intra population variation in T. urticae and E. lewisi as effect of host plant species, thus these should be considered for identification in both mite species.