沿海榆毡蚧的生物学特性及防治

园林重要害虫沿海榆毡蚧Eriococcus costatus(Danzig)在山西太谷1年发生1代,以2龄若虫及预蛹越冬。雌虫经卵、1龄若虫、2龄若虫、成虫完成生活史。雄虫则经卵、1龄若虫、2龄若虫、预蛹、冬前蛹(无翅型)、无翅雄成虫和部分若虫到冬后化蛹(有翅型)、有翅雄成虫,完成其生活史。影响该虫种群动态的主要生态因子包括温度、湿度、食料、天敌等,其中湿度在初孵若虫期是最主要的影响因子。4月上中旬为该虫的最佳防治时期,杀虫剂宜采用内吸性、触杀型的,且脂溶性效果较好。

Bionomics of felt scale, Eriococcus costatus and its control

The biology and life_history of the felt scale(Eriococcus costatus) has been presented underlying detailed observations and lab examinations.Its life history is firstly reported all_round and charted.The pests occur a generation per year in Shanxi Province,the central of China,living through winter in 2nd nymph or pre_pupae.Adult females develop through egg,first nymph,second nymph and adult.But adult males involve egg,first nymph,second nymph,pre_pupae,pupae before winter(the type without wing) and adult without wing or pupae after winter(the type with wing) and adult with wing.In addition,the important ecological factors are found of affecting the pest population dynamic including temperature,humidity,food and nature enemy,but humidity is most important during egg hatching.According to these results,the appropriate preventing time for the pest should be in the middle of April.