carried out on it. P. zeae was least mean population and frequently relative the others. Considering the importance of these species, it is suggested that scheduling more studies to assess their economic importance and management approaches. Tangerine was considered resistant to P. jaehni in Brazil and because this nematode observed on tangerine rootstock in north Iran. Therefore recommended that prevent of culture sensitive rootstock in this zone. Also, most species diversity is seen in the two regions Noshahr and Tonekabon that a large part of the country’s citrus production is devoted to these areas. So, the purposed measures for controlling root lesion nematodes, including biological and chemical control and resistant varieties will be done. Further studies are required to determine the economic importance, biology, ecology and host range of species of root lesion nematode on citrus. Their identification using both morphological and molecular criteria may also need to be investigated, as complications may arise using the current diagnostic methods.