Here's a blog post related to a paper in the Journal of Applied Ecology that demonstrates the ability the ability of natural predators to control pests when the natural predators are provided suitable habitat.
Their study was in South Africa and predation on pests was highest near natural habitat and declined with increasing distance. The pests are identified (two insects and a fungus) but the predators were not (at least not in the abstract) and that's a little frustrating.
Looks like an interesting paper.
Ecological research and life at mid-sized liberal arts university
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