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There are several mechanical control methods to combat S. canadensis stands. One effective method against Solidago species is mowing twice a year (May and August) for several years, or cultivation during summer in dry weather. After mowing, sowing of a grass/forbs mixture can control growth of S. canadensis stands resulting in a strong decrease in shoot density (Voser-Huber, 1983). After five years of annual mowing, the cover of the S. altissima was only 12% compared with 41% in uncut quadrats in Switzerland and fertiliser applications tended to reduce the cover of S. altissima in uncut quadrats (Joshi and Matthies, 1996).
Canada goldenrod reacts positively following low- to moderate-severity fires (Medve, 1984; Richards and Landers, 1973, both cited in Coladonata, 1993).
Biological control presents one method to manage S. canadensis, since it is known that biomass allocation and physiology of the plant in its native range are influenced by herbivores. In Europe, herbivore pressure is low. Snails and small rodents rarely feed on stems and leaves. In Switzerland, 18 phytophagous insects feeding on the S. canadensis are known (Weber, 2000).
The insect fauna of S. altissima (as S. canadensis var. scabra), S. fistulosa, S. gigantea and S. leavenworthii was surveyed in 1981-84 in and around Gainesville, Florida, USA (Fontes et al., 1994). The 122 phytophagous species collected are listed and classified according to relative frequency of occurrence, guild, host range, plant part attacked, life stages collected and associated Solidago species. Only 14 (11%) of the phytophagous species are known to be restricted to Solidago and Aster (Compositae) and there were eight insect species considered as possible biological control agents of Solidago spp. Eurosta sp. attacking roots, two leaf eaters (Ophralella sexvittata and Sparganothis distincta), two leaf miners (Agromyzidae sp. and Cremastobombycia solidaginis), a leaf galler (Asteromyia carbonifera) and Schizomyia racemicola and Schinia nundina attacking flowers and seeds.
S. canadensis is one of 14 selected species in a collaborative biocontrol project between USA and China (Ding et al., 2006).
Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources: