A Seed-borne Nematode Infestation in Annual Asters

Abstract

Aphelenchoides ritzema-bosi has a wide host-range but is most frequently recorded as a pest of chrysanthemums. In this plant, infestations usually start at the base of the stem and work upwards in the direction of the flower head. In severe attacks, most of the leaf area is killed, and the flower head itself may become infested. Chrysanthemums are normally propagated vegetatively, and hence seed-borne infestation is unlikely to occur. However, some hosts of A. ritzema-bosi are grown from seed, and the object of this communication is to record seed-borne infestation in the annual aster (Callistephus chinensis).