Evidence of a polymorphic life cycle in the hemlock woolly adelgid, Adelges tsugae (Homoptera: Adelgidae)

Hemlock woolly adelgid, Adelges tsugae Annand, has a polymorphic life cycle which involves hemlock, Tsuga and spruce, Picea . Studies in Connecticut revealed that about half of the offspring produced by the sistens during June of two consecutive years became wingless adult progrediens. These closely...

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