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چکیده
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In order to identify mirid bugs in alfalfa fields of Hamedan province a study carried out during 2006. The specimens collected by sweep net two times per week and identified by using different characters, especially external genital organ. In this order, Lygus rugulipennis Poppius, L. pratensis L., L. gemellatus H.-S., L. punctatus (Z.), Stenodema virens L. and Adelphocoris lineolatus (Goeze) were identified. These insects had a phytophagous role. Popuation fluctuation of these insects also determined. Amongst them L. rugulipennis, L. pratensis and Adelphocoris lineolatus have the highest and S. virens the lowest density, respectively. This insect is highly polyphagus and preferred alfalfa under Hamedan conditions and cause damage by flower shattering. Numberous natural enemies were found in the fields that were effective in population reduction of the above mentioned pests.
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