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2006

Iowa State University

Agricultural Science

NCRPIS Conference Papers, Posters and Presentations

Articles 1 - 3 of 3

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Predicting The Risk Of Naturalization For Non-Native Woody Plants In The Chicago Region, Kristen Kordecki, Mark P. Widrlechner, Peter Bristol Jun 2006

Predicting The Risk Of Naturalization For Non-Native Woody Plants In The Chicago Region, Kristen Kordecki, Mark P. Widrlechner, Peter Bristol

NCRPIS Conference Papers, Posters and Presentations

No abstract provided.


Individual And Population Aspects Of Interactions Between Cucurbits And Pseudoperonospora Cubensis: Pathotypes And Races, A. Lebeda, M. P. Widrlechner, J. Urban Jan 2006

Individual And Population Aspects Of Interactions Between Cucurbits And Pseudoperonospora Cubensis: Pathotypes And Races, A. Lebeda, M. P. Widrlechner, J. Urban

NCRPIS Conference Papers, Posters and Presentations

This paper reviews the current state of knowledge regarding variation in interactions between Cucurbitaceae and Pseudoperonospora cubensis as a backdrop for the development and use of systems to characterize pathogenicity at the individual and population levels. Host-parasite specificity and interactions between Cucurbitaceae and P. cubensis exhibit significant variation on both the individual and population level. However, our phytopathological and genetic knowledge of the interactions between individual P. cubensis isolates and a broad range of accessions of most important genera of cultivated cucurbits (e.g., Cucumis, Cucurbita, Citrullus) remains limited. Recently, an improved differential set of cucurbit accessions was developed to ...


While They Were Asleep: Do Seeds After-Ripen In Cold Storage? Experiences With Calendula, Mark P. Widrlechner Jan 2006

While They Were Asleep: Do Seeds After-Ripen In Cold Storage? Experiences With Calendula, Mark P. Widrlechner

NCRPIS Conference Papers, Posters and Presentations

Methods to break seed dormancy are of great interest to plant propagators, with many papers on this topic presented at past I.P.P.S. meetings. For example, in Vol. 54 of our Combined Proceedings of the International Plant Propagators’ Society, there were reports on embryo culture to avoid dormancy (Douglas, 2004) and recommendations on dormancy-breaking techniques for Helleborus (Bush, 2004), Salvia (Navarez, 2004), and many wildflowers and grasses native to the North Central U.S.A. (Diboll, 2004). As propagators, we typically want quick methods that consistently result in high germination rates without large labor inputs. But if we ...