 The study evaluates the effects of root-knot nematodes, maloidagine incognita, on growth and yield parameters of 15 cucumber cultivars. The results show that m-incognita significantly negatively affects all growth and yield parameters with highly susceptible cultivars experiencing maximum reductions in these parameters while resistant cultivars experience minimal reductions. Additionally, the study finds that root weights increase as a result of nematode infection with highly susceptible cultivars experiencing the maximum increase. The study concludes that four cucumber cultivars, long green, market more, pioneer 2, and dynasty, experienced no significant damage compared to susceptible cultivars and are approved for cultivation in nematode infested soils. This article was authored by Tarek Muktar and Mohamed Samir Kayani.