Table 5.

Predicted patterns of gene flow, population structure, and genotypic diversity per Diehl & Bush (1984) category and sub-category. Categories in bold are consistent with data in the present study

Diehl & Bush category	Sub-category	Genetic differentiation	Population structure	Genotypic diversity
Nongenetic	Endosymbiont	Between biotype	Minor structure biotype or geography	Biotype 2 less diverse
Nongenetic	Phenotypic Plasticity	None	No clustering or by geography	No significant difference between biotypes
Ubiquitous genetic	Gene for Gene	None	Minor structure biotype or geography	Biotype 2 less diverse
Ubiquitous genetic	Epistasis	None	No clustering or by geography	No significant difference between biotypes
Geographic race	N/A	Strong between biotype	Cluster by biotype	Sig Dif in diversity
Host race	N/A	Strong between biotype	Cluster by biotype	Significant difference in diversity
Species	N/A	Strong between biotype	Cluster by biotype	Significant difference in diversity