RESUMO: O inseto Rhynchophorus palmarum é o principal vetor do nematoideBursaphelenchus cocophilus, agente causal do anel-vermelho, responsável por uma alta taxa de mortalidade de palmas de óleo. Assim, o objetivo deste trabalho foi verificar por meio da geoestatística, a dependência espacial e a melhor distribuição de armadilhas no campo visando o controle de R. palmarum. As quadras experimentais foram georreferenciadas buscando o máximo de precisão no perímetro deste e das plantas que a compõem. A quantidade de insetos capturados foi afetada pela variação de precipitação, aumentando nos meses de maior estiagem na área experimental. A distribuição espacial do R. palmarum é agregada com dependência espacial descrita pelo modelo esférico e exponencial, formando "reboleiras" de 175 a 710 m de raio. O alcance máximo encontrado para o inseto foi 710 metros com área de influência de 158,4 ha e o mínimo de 175 m com área de influência de 9,6 ha, utilizando esses dados, para melhorar o seu controle populacional recomenda-se distribuir 1 armadilha a cada 10 ha, localizadas nas periferias das quadras. ABSTRACT: The Rhynchophorus palmarum insect is the main vector of nematode

Análise espacial da mosca-negra em sistema agroflorestal de citros Spatial analysis of blackfly in agroforestry system of citrus AbstractThe aim of this study was to characterize the spatial distribution of citrus black fly (Aleurocanthus woglumi) in citrus orchard in agroforestry plantation in Pará State, Brazil. The experimental area is located in Capitão Poço, Northeastern Pará. Twelve samples were taken monthly where the presence or absence of the pest in the experimental area were evaluated. From each sampling point (plant) we obtained the value of the variable and the coordinates (latitude and longitude). By the parameters of semivariogram models the surveys were interpolated by kriging method which provided us spatial distribution maps of the areas of higher and lower infestation of the black fly. The results showed that the spatial distribution of black fly takes place predominantly in clusters with spatial dependence described by the spherical model, forming clusters from 15.5 to 34 m (range of the model).

The aim of this work was to evaluate the spatial and temporal distribution of males and females of R. palmarum using geostatistics as a tool. The experiment was carried out in a commercial oil palm plantation area, in the municipality of Moju (PA), Brazil. Monthly samplings were performed, from June 2013 to May 2014. The sampling of insects was carried out through bucket-type traps with pheromone and food attractant, all georeferenced. Population fluctuation, Pearson correlation and spatial analysis were performed through geostatistics. Among the abiotic factors evaluated, only relative humidity and insolation showed a significant correlation for the insect population. The spherical model was the one that presented the best fit, with ranges for males of 240 to 550 meters and females of 300 to 550 meters. The Kriging maps indicated for both sexes, a moderately pattern of aggregate infestation, located on the edges of the oil palm plantation block, mainly close to the native forest. The results indicate that the traps should be distributed on the edges of the oil palm plantations.

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The leaf crown borer Eupalamides cyparissias (Cramer, 1775) is an important pest of coconut (Cocos nucifera L.) and other palms (Arecaceae) of economic importance, attacking the base of leaves, inflorescences, and infructescences, increasing fruit abortion. The objective of this study was to evaluate the spatial correlation of the infestation rate of E. cyparissias in coconut plantation blocks in the Brazilian Amazon, from January to December 2019, in the city of Santa Izabel, Pará, Brazil. The study area is a farm subdivided into 157 blocks of a commercial plantation of the green dwarf coconut. The Local Moran’s Index was used to evaluate the existence of spatial autocorrelation of the E. cyparissias infestation rate in the 157 blocks with neighboring blocks. The infestation rate was calculated by the ratio between the number of plants attacked by the borer and the total number of plants in a block. There is a significant correlation of the symptomatology of the attack by E. cyparissias in the blocks of the experimental area, which indicates an aggregated pattern of distribution. There is no significant correlation between the attack by the borer and the age of the coconut tree; however there is a significant correlation between the attack by the borer and proximity to forest areas. These results indicate that forest regions are foci of infestation by the borer in coconut plantations.