بررسی مشخصه‌های زمین‌آماری جمعیت شته Haris Acyrthosiphon pisum و کفشدوزک شکارگر آن Coccinella septempunctata در مزرعه یونجه شهرستان بروجرد(لرستان)

Green pea aphid Acyrthosiphon pisum is one of the most important species of aphid and ladybug Coccinella septempunctata is one of their important predators in alfalfa fields. . This research was carried out in the crop year of 2021-2022 in the alfalfa field of Borujerd city (Lorestan) with an area of seven hectares, which was divided into 130 grids of 25x25m and sampling of aphids and ladybugs was done using a 1x1m quadrat and in each grid two The quadrat was thrown randomly and the number of ladybugs inside the quadrats was counted, and for aphids, six stems were selected and counted from each of the quadrats and a total of 12 stems. Exel 2010, spss 26 and GS+ version 5.1 software were used for data analysis. The data related to each station were checked for normality with the help of Kolmogorov-Smirnov test, and if necessary, they were placed in the determined coordinates with the help of one of the appropriate data conversion methods. To present variogram curves and kriging maps, spherical, linear, Gaussian and exponential models were tested the model with the highest r2 and degree of spatial dependence was selected as the best model. The results of geostatistical analyzes for the above aphid showed that out of 25 sampling datasets, 23 data were fit with the spherical model, and two datasets with the exponential model. For the ladybug C.Septempunctata , 11 data showed a better fit with the spherical model and 14 data with the exponential model. The degree of spatial dependence for the above aphid was between 0.714 and 0.999, and for the predatory ladybug, between 0.624 and 0.998, which shows that more than 60% of the variability (variance) between the data has a spatial structure and r2 for Both types varied between 0.57 and 0.97. The distribution pattern of both species was aggregative, and the effective range for the aphid species was between 110.6 and 345.2 m and between 80.9 and 146.3 for C.Septempunctata . A. Pisum aphid entered the field from the south and southwest side in the middle of April, and in the following days, it stretched towards the west and the center of the field. the ladybug C. Septempunctata was seen in the northern areas and with less density in the center of the field. With the increase in the population of both species, according to the kriging maps and graphs, the predatory ladybug population is drawn to the areas with a high population of the desired aphid species and it matches in the central areas of the farm. By preparing distribution maps, it is possible to maintain the population of natural enemies at the field level by implementing site-specific integrated pest management.