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Potato, solanum tuberosum L. is a major food crop in many countries of the world including Egypt. The production of this crop is already expanded to relatively warm and humid regions that are suitable to the survival and development of several pathogenic pests, including nematodes. Such improvement has come mainly from certain fertilizer applications, higher yielding varieties, and better methods of controlling weeds, pests and diseases such as nematodes as well as improve plant growth by certain chemical regulation i.e. growth regulators. Moreover, such growth regulators i.e. IAA...