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Trends in Entomology   Volumes    Volume 15 
Spatial patterns of Frankliniella occidentalis (Pergrande) (Thysanoptera: Thripidae) populations in Gladiolus communis L
R. Quiñones-Valdez, J. R. Sanchez-Pale, A. K. Pedraza-Esquivel, A. Castañeda-Vildózola, O. Franco-Mora, R. L. Ocaña-de Jesús, A. T. Gutierrez-Ibañez
Pages: 35 - 45
Number of pages: 11
Trends in Entomology
Volume 15 

Copyright © 2019 Research Trends. All rights reserved

Frankliniella occidentalis is the main pest affecting gladiolus flower in the southeast region of the state of Mexico. It is currently managed using blanket application of synthetic pesticides, without consideration of its spatial arrangement within the crop. The objective of this work is to analyze the spatial patterns of this insect using geostatistical techniques, over three phenological stages of growing in the main gladiolus-producing region in Mexico during the summer-fall cycle in 2013-2014. Semivariograms were obtained using models fitted with R program, and density maps were generated using kriging. Results showed aggregated populations of insects in all three phenological stages of the crop, independent of insect population density, during both years of the study. The insect’s spatial patterns changed noticeably from one plot to another within the same municipality, as well as from one phenological stage to the next. The spherical and exponential model was generally the best fit, followed by the lineal model, showing that the aggregation centers begin in a specific location, then radiate continuously outward throughout the plot. The observed points of aggregation allow for specific, targeted application of control methods, particularly synthetic pesticides. The maps generated allow the visualization of the changes in spatial patterns of aggregation of F. occidentalis during the different phenological stages of gladiolus cultivation.
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