Cereal Cyst Nematode, Heterodera filipjevi (Madzhidov, 1981) in Wheat Fields of Chaharmahal and Bakhtiari Province, Iran and Its Distribution Based on Interpolation by Geographic Information System

Abstract

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 212 composite soil and r oot samples were randomly collected from different wheat fields of nine districts of the province during 2013 - 2014. The soil samples were explored for number of cysts, second - stage Juveniles (J2) 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 42% of soil samples were infested with Heterodera filipjevi containing an averag e of 994 eggs and J2 per 200 g of soil. The maximum infestation was observed in Dehsahra region in Lordegan district with an average of 4720 eggs and J2 per 200 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 Sh ahrekord 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. Keywords : Cereal cyst nematodes, Chaharmahal and Bakhtiari, Distribution, GIS, Interp olation, Population density.