Abstract:
:Cucurbit downy mildew (CDM), caused by the oomycete pathogen Pseudoperonospora cubensis, is a devastating disease that affects cucurbit species worldwide. This obligate, wind-dispersed pathogen does not overwinter in Michigan or other northern regions and new isolates can enter the state throughout the growing season. To evaluate the regional and temporal population structure of P. cubensis, sporangia from CDM lesions were collected from cucurbit foliage grown in Michigan and Ontario field locations in 2011. Population structure and genetic diversity were assessed in 257 isolates using nine simple sequence repeat markers. Genetic diversity was high for isolates from Michigan and Canada (0.6627 and 0.6131, respectively). Five genetic clusters were detected and changes in population structure varied by site and sampling date within a growing season. The Michigan and Canada populations were significantly differentiated, and a unique genetic cluster was detected in Michigan.
journal_name
Phytopathologyjournal_title
Phytopathologyauthors
Naegele RP,Quesada-Ocampo LM,Kurjan JD,Saude C,Hausbeck MKdoi
10.1094/PHYTO-02-15-0043-Rsubject
Has Abstractpub_date
2016-04-01 00:00:00pages
372-9issue
4eissn
0031-949Xissn
1943-7684journal_volume
106pub_type
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