determine of isolation distances for seed potatoproduction in ardabil region

This study was performed to determine the distance of isolation for the seed potato production from ware potato in three regions of ardabil, namin and nir. the experiment was carried out in a randomized complete block design (rcbd) with five distances (100, 200, 300, 400 and 500 meters from ware potato) and three replications with super elite (se) class of agria potato cultivar from ware potato as the source of infection studied by elisa during 2014 and 2015. according to standard of seed and plant certification and registration institute (spcri), as many as 200 leaves and 200 tubers samples of each distance were collected and their virus infection was done by elisa assay. analysis of variance tuber yield showed that were significant differences between regions, years and distances of isolation. in terms of tuber yield, between distances 500, 400 and 300 meters, there was no significant difference and they were in one group. by reducing isolation distance from 500 meters to 100 meters from host of viral diseases vectors (edible potato of agria cultivar) tuber yield reduced from 44.328 t/ha to 39.828 t/ha (about 4.5 t/ha, or 10.15 percent). average infection of rhizoctonia fungal diseases of tuber in isolation distances and three regions were about 5 percent. in three regions and five isolation distances, tubers were without infection of vascular rot fungus diseases, without infection of bacterial diseases of blackleg and brown rot and without infection of potato moth pest. in each three regions, the pvy virus was in distances 100, 200 and 300 meters from the host. insects of collected from yellow pan were 1.1% green peach aphid, 1.78% thrips, 32.54% green cicada, 57.99% brown cicada, 1.18% hawk moth of potato and 5.41% other insects. to determine the exact isolation distance in different regions of potato cultivation in ardabil province, additional projects, provided in the suggestions, need to be implemented.