The distribution and population composition of Lymantridae in Xiamen City were investigated by collection, light trap and pheromone trap in the present paper. It was showed that Lymantria xylina was the predominant species and L. dispar was not found in Xiamen Area. Meanwhile, Pest risk analysis of L. dispar was carried out to know about the risk of L. dispar to invade Xiamen Area and the R value was 2.2311, which showed the insect was the pest with high risk in Xiamen Area.Finally, the material and literature of L. dispar was listed systematically in the present paper to establish the database to be convinent to inquire.
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