期刊
BIOLOGICAL CONTROL
卷 50, 期 1, 页码 66-72出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.biocontrol.2009.02.008
关键词
Insect herbivory; Invasion biology; Plant-insect interactions; Invasive plants; Biocontrol agent selection; Larinus minutus; Plant density
资金
- Brink/McLean Grassland Conservation Fund
- Natural Science and Engineering Research Council of Canada
The biological control program for diffuse knapweed, Centaurea diffusa Lamarck, a Eurasian plant that has invaded large areas of grasslands in western North America, has gone on for over 35 years. This program involved the release of 12 biological control agents of which four are numerous and widely distributed; two species of Tephritid flies, Urophora affinis and Urophora quadrifasciata, the root boring beetle, Sphenoptera jugoslavica, and the most recently established weevil Larinus minutus. Field observations show that diffuse knapweed densities declined at sites in British Columbia Canada where the weevil L. minutus became established. Decline in diffuse knapweed density did not occur where densities oft. minutus were low. Field cage experiments showed that feeding by L. minutus damaged rosette leaves and bolting stems, seedling density and the density of rosette and flowering diffuse knapweed and reduced seed production, plants. (C) 2009 Elsevier Inc. All rights reserved.
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