Abstract
Host-parasite compatibility strongly influences the sex determination of potato cyst nematodes (Globodera rostochiensis and G. pallida). The probability of a juvenile developing into a male may be higher in the case of poor compatibility than in the case of full compatibility. As a result, avirulence toward the resistant host may lead to the production of more males. In contrast, virulence favors the production of females. These conflicting sexual trends imply opposing selection pressures by a resistant host. This may create an equilibrium frequency between the avirulent and the virulent nematodes, thereby preserving host resistance [...]
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