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.
