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It is suggested that competing co-dominant species in natural ecosystems may be maintained in equilibrium by an ecological, negative feedback system involving reciprocal, host-specific parasites. A simple model is derived to describe this relationship and a hypothetical example computed to illustrate its use. The model has important implications for the management of natural forests and for the practice of monoculture. These are briefly discussed.

Plant Competition Mediated by Host-Specific Parasites-a Simple Model