Determining the spatial distribution of the predatory ladybird Coccinella septempunctata using geostatistics in alfalfa fields in Dezful (Khuzestan) and Borujerd (Lorestan) Counties | ||
| آفات و بیماری های گیاهی | ||
| Volume 92, Issue 2, March 2025, Pages 182-197 PDF (925.94 K) | ||
| Document Type: Agricultural Entomology | ||
| DOI: 10.22092/jaep.2025.366601.1525 | ||
| Authors | ||
| iman sabouri* 1; Arash Rasekh2; Amir Mohseni Amin3 | ||
| 1Ph.D. student, Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| 2Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| 3associate professor | ||
| Abstract | ||
| Coccinella septempunctata is one of the most important natural enemies of alfalfa aphids. This research with the aim of investigating the geostatistical features of this ladybug species in alfalfa fields of Dezful and Borujerd cities, respectively, with an area of five and seven hectares (90 and 130 25x25 m grids). Sampling of ladybirds was peformed using a 1x1 m quadrat, two quadrats were randomly placed in each grid and the number of ladybirds inside each quadrat was counted and recorded by direct observation. Data analysis was done using GS+.Tthe variograms were calculated and presented by determination the model of spatial dependence changes with increasing distance between samples. The results of geostatistical analyzes for the above species of 21 sampling weekly datasets in Borujerd alfalfa field showed that, 13 and eight data were better fit with exponential and spherical models, respectively. In Dezful, 16 data was better fitted with spherical model and five data with exponential model. The degree of spatial dependence varied between 0.521 and 0.999 and r2 varied between 0.52 and 0.99. The distribution pattern of this species is aggregative and the effective range for this species was between 94.6 and 481.8 m. The results of this research showed that using geostatistical methods provided proper information on the ecology, distribution and distribution of this species in the field. Also the possibility of using this method can make research projects much easier instead of dense sampling methods. | ||
| Keywords | ||
| Alfalfa; spatial autocorrelation; effective range kriging; variography | ||
| References | ||
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