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Providing evidence to improve practice

Action: Use herbicides to remove invasive plant species Forest Conservation

Key messages

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  • One replicated, randomized, controlled study in the USA found no effect of invasive plant control using herbicide on the total native plant species richness.


Supporting evidence from individual studies


A replicated, randomized, controlled study in 2000-2005 in temperate broadleaf forest in Ohio, USA (Hochstedler et al. 2007) found no effect of control of invasive garlic mustard Alliaria petiolata on native plant species richness and diversity. Species richness was similar between treatments in both old-growth (sprayed: 8.7; unsprayed: 8.0 species/plot) and second-growth forests (sprayed: 10.6; unsprayed: 10.5). The same was true for species diversity (Shannon’s index old-growth: sprayed 1.7, unsprayed 1.4; second-growth: sprayed 2.0, unsprayed 2.0). Data were collected in 2005 in 25 sprayed (garlic mustard individuals sprayed with glyphosate herbicide Roundup© PRO at the start of winter in 2000-2004) and 25 unsprayed plots (1×1 m). Plots were randomly placed in each of 16 ha second-growth and 20 ha old-growth forest sections.


Referenced papers

Please cite as:

Agra H., Schowanek S., Carmel Y., Smith R.K. & Ne’eman G. (2018) Forest Conservation. Pages 285-328 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2018. Open Book Publishers, Cambridge, UK.