A review of biological control in Western and Southern Europe.
Pp. 75 Creeping thistle-Cirsium arvense (L.) Scop. (Compositae) (D.J. Greathead) An unsuccessful attempt to introduce Altica carduorum into Great Britain for control of creeping thistle (Cirsium arvense) is discussed.Pp. 75-78 Aquatic weeds (H. Pschorn-Walcher; D.J. Greathead) Progress in various European countries in the use of Chinese grass carp to control aquatic weeds is reviewed. Some fears are expressed concerning the possibility of a simultaneous introduction of parasites and also possible upset in the balance of a lake ecosystem by too rapid destruction of certain types of weed.Pp. 134-135 Progress in evaluation and supply of biological control material from Europe to America and Australasia is reviewed.P. 135 Skeleton weed-Chondrilla juncea (L.) (Compositae) A rust fungus (Puccinia chondrillina) and two insect predators have been introduced into Australia with some success. The fungus reduces viability, regenerative ability and seeding capacity of the weed.P. 136 Opium poppy and Indian hemp (Papaver somniferum (L.) (Papaveraceae) and Cannabis sativa (L.) (Cannabinaceae) Host specificity tests in Europe on insect predators of the opium poppy are not so far conclusive. P. 136-138 An overall review of the situation.