Study on distribution of the pathogenic fungal agents of wheat root and crown rot in West Azarbaijan province

Subject Areas : Plant Pests

Javad Valizadeghan ¹ , Abbas Ali Ravanlou ²

1 - Department of Plant Pathology, College of Agriculture,Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran.
2 - Department of Plant Protection, Agricultural and Natural Resources Research Institute of West Azarbaijan Province, Oromieh, Iran

Received: 2016-04-13 Accepted : 2016-07-23 Published : 2016-11-21

Keywords: Wheat, Fusarium, West Azerbaijan, Pythium, Bipolaris, RhizoctoniaCrown and root rot disease,

Abstract :

This study aims to identify factors important pathogenic fungi in the roots, crown and base irrigated wheat in Western Azerbaijan Province in 1393 was carried out. For this purpose, wheat fields in different regions of Urmia, Naghadeh, Mahabad, Miandoab, Piranshahr, Oshnavieh, Khoy, Salmas and Qarah Zia od Din visited and from fields with symptoms of growth retardation accompanied by discoloration and decay in root, crown and base samples were taken. Pieces of 1 cm in length from the root, crown, and base were grown on acidic PDA media. Separation and purification steps of fungi were performed on WA, PDA, CMA, SNA, PCA and NM culture media. Pathogenicity test on the wheat seedling of pioneer cultivar using wheat grains and placement of mushroom blocks in the vicinity of plant organs under greenhouse conditions was carried out. Based on morphological characteristics including color and colony growth, Shape and dimensions of conidia, and conidia producing cells identified using valid keys. In this study, samples were taken from 56 farms and 81 fungal isolates belonging to the genus Fusarium, Bipolaris, Rhizoctonia and Pythium were isolated and identified. In this study, species, F. culmorum, F. avenaceum, F. graminearum, F. acuminatum and B. sorokiniana as important factors in irrigated wheat fields to nominate dumped into decay. Most of the distribution range of the genus Fusarium respectively.