Tarbiat Modares University Journal of Crop Protection 2251-9041 1 3 2012 09 01 Identification and Pathogenicity of Pythium Species on Cantaloupe in Khorasan Razavi Province of IRAN 239 247 1051 10.48311/jcp.2012.1051 EN Samaneh Teymoori Department of Plant Protection, Gorgan university of Agricultural sciences and Natural Resources,Gorgan, Iran. Mohammad Hajian Shahri Department of Plant Protection, Khorasan Razavi Agricultural and Natural Resources Research Center, Mashhad, Iran. Kamran Rahnama Department of Plant Protection, Gorgan university of Agricultural sciences and Natural Resources,Gorgan, Iran. Hamid Afzali Department of Plant Protection, Khorasan Razavi Agricultural and Natural Resources Research Center, Mashhad, Iran. Journal Article In order to study the role of Pythium species associated with cantaloupe root and crown rot, samples were collected from infected fields in different areas of Khorasan Razavi province during 2009-2010. The Root pieces were washed and cultured on CMA-PARP medium. The pythium isolates were then purified by hyphal tip method and identified based on van der Plaats-Niterink mycological key. The pathogenic species were identified as Pythium aphanidermatum, P. ultimum var. ultimum, and P. deliense. The pathogenicity of isolates on cantaloupe seedlings was tested under greenhouse conditions by using wheat grain inoculum. The results indicated that P. aphanidermatum was the most prevalent species and was recovered in all the regions. P. ultimum was isolated from Neyshabour, Fariman and Mashhad whereas P. deliense was detected in Khaaf. This to our knowledge, is the first report on occurrence and distribution of Pythium species causing root and stem rot on cantaloupes in Khorasan province.

https://jcp.modares.ac.ir/article_1051_456ac9b0d15a8b7f1e71073221059886.pdf