57 native potato tuber samples collected from different potato growing region of Iran, planted on single rows in Karaj College experimental station. Plant samples of each single row plus 9.25 Fresh foliage samples collected from fields under new introduced cultivars were tested for potato virus (PVM) infection during growing season. Also 78 weeds and field crops belonging to Solonacae and Leguminosae from or neighboring to potato field were tested. Results indicated that PVM was not found on any plant other than potatoes. PVM was detected on 16 samples of 57 old vars, Virus was not seen in any samples collected from fields under new varieties. Results show that PVM is limiting in this crop. PVM detecting is difficult using assay hosts. Best test plants were French bean var Red kidney, Showing pinpoint necrotic LL, also Datura metel and Nicotiana debneyi are useful for virus detection showing chlorotic local lesion. Also microprecipition and gel diffusion test can be used for virus detection but Elisa was the best method. PVM infected plant showed 11-19.5 percent yield decrease in 3 cultivars tested.
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