نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه گیاه پزشکی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران
2 گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران.
3 موسسه تحقیقات گیاهپزشکی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Spotted alfalfa aphid, Therioaphis maculata is one of the most important aphid species, and Hippodamia variegata is important predator in alfalfa fields.This research investigated the spatial structure to achieve site-specific integrated management in an alfalfa field located in Boroujerd County, Lorestan province with an area of seven-hectare, divided into 130 grids of 25x25m. Sampling of aphids and ladybirds was done using a 1x1m quadrat, and in each grid, two quadrats were thrown randomly, and the number of ladybirds inside the quadrats was counted. For aphids, six stems were selected and counted from each quadrat. The results for T. maculata showed that 16 sampling datasets were fit with a spherical model, and two datasets with an exponential model, out of 18 sampling datasets. For the ladybird, 14 data showed a better fit with a spherical model and 8 data with an exponential model (a total of 22 sampling datasets). The degree of spatial dependence for the above aphid was between 0.742 and 0.999, and for the ladybird, between 0.500 and 0.999, which shows that more than 50% of the variability between the data has a spatial structure. The distribution pattern of both species was aggregative, and the effective range for the aphid species was between 90.6 and 556.2 m. in the spherical model and between 102.6 and 357.5 for H. variegata. Preparation of distribution maps for this natural enemy and prey allows for maintaining the population of natural enemy at the field level by implementing site-specific integrated pest management.
کلیدواژه‌ها [English]
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