Wheat midge is the important pest on wheat in Northern Hemisphere, and it is also one of important pests on wheat in our country. It belongs to the Diptera Cecidomyiidae.

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The sexual behavior of chrysanthemum gall midge, Rhopalomyia longicauda (Diptera: Cecidomyiidae) such as the release of sex pheromone and calling behavior, were studied indoors and in a field trapping experiment. The sex pheromone was collected with an organic solvent aided by a glass container of charcoal-purified air. Laboratory observations showed that most males emerged 1-2 h before females.

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A total of 19,781 insect individuals belonging to 959 morphospecies, 145 families and 15 orders were collected. The most abundant orders were Diptera (69.68%), Homoptera (11.19%) and Hymenoptera (10.10%). At the family level, Chironomidae (17.67%), Mycetophilidae (12.32%), Cicadellidae (8.32%), Ceratopogonidae (7.56%), Sciaridae (7.39%) and Cecidomyiidae (5.81%) were the most abundant taxa. Although there were little differences in similarity among the three sampling plots, the dominant orders and families in theses plots differed. The meadow had the highest diversity while the spruce forest had the lowest diversity.

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