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ARS Home » Midwest Area » Madison, Wisconsin » Vegetable Crops Research » Research » Publications at this Location » Publication #236213
Title: Potential impact of a hybrid leaf blight disease that infects both carrot and potato

Author
item Halterman, Dennis

Submitted to: Meeting Abstract
Publication Type: Proceedings
Publication Acceptance Date: 1/23/2009
Publication Date: 2/3/2009
Citation: Halterman, D.A. 2009. Potential impact of a hybrid leaf blight disease that infects both carrot and potato [abstract]. Wisconsin Annual Potato Meeting.

Interpretive Summary:

Technical Abstract: Alternaria dauci and Alternaria solani are two forms of necrotrophic fungi. A. dauci targets carrot crops, while A. solani mainly targets potato. Both species of Alternaria have been able to produce blight on their respective target plants. Recently, an A. dauci hybrid has appeared that is able to infect both carrots and potatoes with slightly less effectiveness compared to the original pathogens. Using detached leaf inoculations, we determined that most potato species resistant to A. solani are also resistant to the A. dauci hybrid. Using laboratory experiments, we have also studied whether the A. dauci hybrid is a result a genetic transfer of pathogenicity factors between A. solani and A. dauci. We also inoculated potato and carrots in the field in order to determine whether recombination is prevalent.