An investigation was conducted on control of melon flies, Myopardalis pardalino. Cucumis melo var. inodorous is an economic vegetable species widely planted in northeast of IRAN (Provinces of Khorasan and Semnan) and thepesticides application for control of the pests is a major problem. In regard to this, the main aim of this research was to study the influence of intercropping of Cucumis melo var. inodorous, as main crop and Thymus vulgaris and Mentha piperita, as intercrop plants on pest population and fruits damaged with the pest. The check (control) treatment was a field of Cucumis melo var. inodorous without intercrop plants but with pesticide application, Zolon and Diazinon, for pest control (4 times during the growth period). Cucumis melo var. inodorous cultivated with intercropping and without pesticides, gave the beast results, while the check field showed many fruits that damaged by the pest or its larve. The study of repellent behavior of thyme and peppermint to melon flies reveals new opportunities for decrease of chemical use, especially in vegetable growing and organic production of many horticultural crops. Key Word: (Myopardalis pardalino; Muskmelon; Interplanting; Natural Repellent)

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