1a.Objectives (from AD-416):
To determine the population genetic structure of Pythium irregulare, P. sylvaticum, and P. ultimum.
1b.Approach (from AD-416):
Survey three forest tree nurseries for P. irregulare, P. sylvaticum, and P. ultimum; and investigate the population genetic structure of the three Pythium species by SSR and ISSR analyses for similarities.
Completed population analyses of Pythium irregulare and Pythium sylvaticum from three forest nurseries. Analyses of Pythium ultimum are in progress and near completion. There was no evidence that Pythium isolates from one nursery were significantly genetically different from those at the other nurseries, which may indicate that there has been movement of the three pathogens among nurseries. Information regarding the genetic diversity and potential movement of Pythium species among nurseries is useful for the management of Pythium diseases. This research was conducted in support of objective 303 2C Ecology and Epidemiology of Plant Diseases of the parent project.