Canadian Forest Service Publications

Invasiveness of alien plants: Some aspects of the impact of Scotch Broom (Cytisus scoparius (L.) link) on Douglas-fir seedlings and its control. 1999. Prasad, R.P.; Naurais, S. Pages 23-25 (Vol. 5) in M. Kelly, M. Howe, and B. Neill, editors. Proceedings California Exotic Pest Plant Council Symposium, October 15-17, 1999, Sacramento, California. CalEPPC, San Juan Capistrano, CA.

Year: 1999

Issued by: Pacific Forestry Centre

Catalog ID: 20600

Language: English

CFS Availability: Not available through the CFS (click for more information).

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Abstract

Scotch broom (Cytisus scoparius (L.) Link) and gorse (Ulex europaea L.) are two alien plants that pose a serious threat to forested and other landscapes in southern British Columbia, Canada. Both were introduced over a century ago and have established themselves by virtue of unique characteristics: reduced leaves, active stem photosynthesis, nitrogen fixation, profuse seed production, rapid vertical growth, adaptability to varying ecological niches and lack of natural enemies. There are no data regarding impact of these two exotic species on conifers in British Columbia nor is there any satisfactory information on their methods of control. Therefore, experiments were conducted in a field nursery to determine the effects of competition on Douglas-fir seedlings (Pseudotsuga menziesii) and in the greenhouse to determine impact of a biocontrol agent (chondrostereum purpureum) on resprouting behaviour of Scotch broom. Results indicated that Scotch broom suppresses the growth and development of 4-year-old Doulgas-fir seedlings by over 30% and that this seems to be achieved by blocking the inception of photosynthetically active radiation. The bioherbicide agent was very potent in inhibiting the resprouting of Scotch broom.