Two decades ago, the late Walter Westman wrote thoughtfully on the subject of positive and negative effects of invaders. He suggested a phased strategy in which eradication of invasive plants would be balanced with restoration of native vegetation to minimize both ecological and aesthetic impacts.
Westman, W.E. 1990. Park management of exotic plant species: problems and issues. Conservation Biology 4 (3): 254-256. Westman, W.E. 1990. Managing for biodiversity: unresolved science and policy questions. BioScience 40 (1): 29. Annette Olson Seattle, Washington
