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Publication
Ecological basis for the control of Gunnera tinctoria in São Miguel Island
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Authors
Advisor(s)
Abstract(s)
Gunnera tinctoria, an herbaceous plant from South America, is naturalised in São Miguel island (Azores). In this research an ecologically based strategy for G. tinctoria control is suggested. Infestation structure, altitudinal range, associated plants, phenology and natural enemies were studied. G. tinctoria was found from 100 to 900 m of altitude, in plane or highly sloped terrain, on rich soil or gravel, in roadsides, trails, and water streams. Infestation foci were found at 40 Km from introduction site. Populations consisted of isolated or small groups of plants, with reduced cover, associated with other weeds. According to three plant invaders classification systems this plant presents several negative characters in terms of conservation: high seed production, vegetative reproduction, high impact on the landscape. invasion of natural vegetation. Priority of control should be given to satellite populations in high conservation value sites. Control of heavier infestations will need a persistent and global approach.
Description
Proceedings Second International Weed Control Congress Copenhagen, Denmark, 25-28 June 1996.
Keywords
Altitudinal Range Associated Plants Infestation Structure Gunnera tinctoria Natural Enemies Phenology
Citation
SILVA, L., J. TAVARES & A. PENA, (1996). Ecological basis for the control of Gunnera tinctoria (Molina) Mirbel (Gunneraceae) in São Miguel Island. "Proceedings Second International Weed Control Congress Copenhagen, Denmark". Department of Weed Control and Pesticide Ecology, Flakkebjerg. 1-4: 233-239.
Publisher
Brown, H., et al. (eds.)