How do I select alfalfa accessions that are resistant to downy mildew, and have a growth habit that is semi-erect?
The first thing you need to do is find the Multiple Descriptor page for Alfalfa. • Begin with the NPGS page: http://www.ars-grin.gov/npgs/ • Click on Search GRIN to take you to: http://www.ars-grin.gov/npgs/searchgrin.html • Click on Research Crops and Descriptor/Evaluation Data Queries to take you to: http://www.ars-grin.gov/cgi-bin/npgs/html/croplist.pl • On the same line as Alfalfa, click on Query on multiple descriptors to take you to: Multiple Descriptors Query for ALFALFA page at: http://www.ars-grin.gov/cgi-bin/npgs/html/desc_form.pl?68 Note that Descriptors are grouped by type. • Find Downy Mildew listed under DISEASE Descriptors. • Click on Downy Mildew to take you to: http://www.ars-grin.gov/cgi-bin/npgs/html/desc.pl?68038 Read how resistance and susceptibility is defined. • Click on Observed Values to take you to: http://www.ars-grin.gov/cgi-bin/npgs/html/obvalue.pl?68038 Look to see how many plants are resistant to Downy Mildew. Perhaps you should enter a resistance of more
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