Abstract
Abstract: The objective of this work was to assess the relationship between the depth of irrigation water and larval infestation by Oryzophagus oryzae in flooded rice crop. Water depth and larval infestation were evaluated in the upper levee, in between levees, and in the lower levee. The data were subjected to the descriptive statistical and geostatistical analyses. The highest larval infestation occurs in field areas with greater water depth, which is typical of the lower levee. The spatial distribution of O. oryzae larvae is of the aggregate type and depends on the greater irrigation water depth.
Highlights
Resumo – O objetivo deste trabalho foi determinar a relação entre profundidade da água de irrigação e infestação larval de Oryzophagus oryzae em arroz irrigado por inundação
Spatial distribution and larval density can be altered by soil irregularities and flatness, which includes upper and lower levees and the center of the area limited by both levees in sloped areas
Geostatistics is a key tool in determining the spatial distribution of the pest, because it associates the importance of observation and of its location in the estimates of spatial distribution, enabling a better understanding of the spatial behavior of insect pests and, their integrated management (Pazini et al, 2015)
Summary
Resumo – O objetivo deste trabalho foi determinar a relação entre profundidade da água de irrigação e infestação larval de Oryzophagus oryzae em arroz irrigado por inundação. The depth of irrigation water affects the population dynamics of rice water weevils (Martins et al, 2009; Tindall et al, 2013). A greater knowledge of the density, distribution, and spatial dependence of O. oryzae in sloped rice crops, irrigated by flooding, can assist in insect management (Dal Prá et al, 2011).
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