Distribuição espacial e plano de amostragem de Syntermes spp. (Isoptera Termitidae) em áreas de implantação de eucalipto no bioma cerrado

Abstract

Termites are considered initial pest of eucalyptus and have gained increased importance due to the expansion of this culture on pasturelands. Among the pest species, Syntermes spp. is considered the most important, so it is necessary to know the spatial distribution. The objective of this study was to determine the spatial distribution of foraging holes Syntermes spp. for point processes in the Cerrado; simulate a sampling plan to estimate the number of holes of this insect foraging; create maps of kriging regression GLM Infestation holes foraging Syntermes spp. and validate the simulated sampling plan. The study was conducted in a Cerrado area that will later be used for the cultivation of eucalyptus. The spatial pattern was determined by the number of foraging holes and the distance between them. The distribution of termites was adjusted according to the exponential model for the number of foraging hole, both by the method of maximum likelihood (ML). It was concluded that the spatial distribution of Syntermes spp. is aggregated and not homogeneous up to 6m in Cerrado areas of Minas Gerais. Each hole father of this termite foraging is a nest of 30,97m2. The best sampling of these termites is launching a circular plot of 5m radius 100m each (one sample per hectare), distributed in a systematic way in the area. The GLM regression kriging is suitable for generating maps of infestation, aiming to help in the decision making process as to generate maps of infested locations, reducing the cost of control.