Root-knot nematodes are dangerous and economically very important pest of completely cultivated crops in the world, so this study was conducted to test the pathogenicity of root-knot nematode Meloidogyne javanica at different levels of soil infestation by nematode eggs against one of the most common cultivar (hybrid) of cucumber cultivated in Duhok province. Sterilized sandy loam soil was infested with different levels of inoculum of root – knot nematode M. javanica included: 0, 1000, 2000, 4000, 8000 and 16000 eggs/pot after 20 days of sowing cucumber seeds cv. Sayff F1 under greenhouses conditions at College of Agricultural Engineering Sciences / Semel, University of Duhok. Results revealed that the growth criteria of cucumber plants (length, fresh and dry weight of roots and shoots) and chlorophyll content of leaves decreased with increasing of inoculum levels of nematode eggs, whereas the infection criteria increased except with level 16000 eggs / pot at which the infection criteria decreased. At the same time nematode reproduction rate decreased with increasing of nematode inoculum levels.
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