Cereal Cyst Nematode, Heterodera filipjevi (Madzhidov, ۱۹۸۱) in Wheat Fields of Chaharmahal and Bakhtiari Province, Iran and Its Distribution Based on Interpolation by Geographic Information System

To identify the Cereal Cyst Nematodes (CCN) and their distribution and population density in wheat fields in Chaharmahal and Bakhtiari Province based on interpolation by geographic information system, a total of ۲۱۲ composite soil and root samples were randomly collected from different wheat fields of nine districts of the province during ۲۰۱۳-۲۰۱۴. The soil samples were explored for number of cysts, second-stage Juveniles (J۲) and eggs. The species were identified based on morphological, morphometric and molecular characteristics. Analysis was performed by Arc GIS software using interpolation technique for determination of raster map. The results showed that ۴۲% of soil samples were infested with Heterodera filipjevi containing an average of ۹۹۴ eggs and J۲ per ۲۰۰ g of soil. The maximum infestation was observed in Dehsahra region in Lordegan district with an average of ۴۷۲۰ eggs and J۲ per ۲۰۰ g soil. Wheat fields of Kohrang, Kiyar and Farsan districts showed low population density while moderate infestation was observed in Ardal, Ben, Saman and Borujen districts. Instead high population density of H. filipjevi was found in Shahrekord and Lordegan. Based on interpolation of population density and interpolation maps, the eastern part of Shahrekord and southern and western parts of Lordegan districts were predicted as regions with high infestation to H. filipjevi and considered as hotspots for this disease.