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Abstract
The potato tuber moth, Phthorimaea operculella (Zeller). (Lepidoptera, Gelechiidae) is one of the most important insect pests in Egypt and other countries. During the last decades, chemical control with pesticides were considered the only tool which used to suppress the infestation by most pests. We used the biological control to keep the environment clean, in addition to prevent the bad effect of chemical pesticides on plant, human and animal health. The thesis delt the following pointis : [1] Effect of six food types on the number of laid egg and hatching by potato tuber moth.[2] The effect of six types on the duration of potato tuber moth. [3] ] Effect of six food types on the adult emergence by potato tuber moth.[4] The effect of six types on the natural mortality of potato tuber moth.[5] The effect of Steinernema carpocapsae (Wesier) against different stages of the potato tuber moth. [6] The effect of Heterorhbditis bacteriphora pioneer against different stages of the potato tuber moth.