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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Vascular decline in the Oregon pawpaw regional variety trial  [2003]

Postman, J.D.; Hummer, K.E.; Pomper, K.W.;

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A pawpaw (Asimina triloba) regional variety trial (PRVT) was established at the U.S. Department of Agriculture, Agricultural Research Service, National Clonal Germplasm Repository (NCGR), Corvallis, Ore., in Fall 1995. This orchard was a replicated planting of 28 commercially available varieties or advanced selections from the PawPaw Foundation (PPF; Frankfort, Ky.), with eight replicate trees of each selection grafted onto seedling rootstocks and planted in a randomized block design. Two years after planting, 32 trees had either failed to establish or had died after an initial healthy start. By July 1999, 25% of grafted trees had died due to a vascular wilt-like disease, and 2 years later mortality exceeded 50%. Grafted selections with the lowest symptom severity include I-7-2, 2-54, 7-90, 8-58, 9-58, 'Mitchell', 'PA-Golden #1', 'Taylor' and 'Wilson'. Seedling guard trees were unaffected until July 2000, when six guard trees of 76 died and 10 more were declining. By July 2001, 14 guard trees were dead. No fungi were consistently isolated from declining trees. A number of bacteria were isolated from infected trees, but no specific pathogen has been confirmed as the causal agent. Polymerase chain reaction (PCR) tests for phytoplasmas and for the bacterium Xylella fastidiosa were also negative. Research is ongoing to determine if a bacterial pathogen was the cause of the pawpaw decline in the Oregon PRVT.
From the journal
HortTechnology
ISSN : 1063-0198

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
13
Issue:
3
Start Page:
418
End Page:
420
All titles:
"Vascular decline in the Oregon pawpaw regional variety trial"@eng
Other:
"Paper presented at the Second International Pawpaw Conference held September 21-22, 2001, Frankfort, Kentucky. Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
13
Issue:
3
Start Page:
418
End Page:
420
All titles:
"Vascular decline in the Oregon pawpaw regional variety trial"@eng
Other:
"Paper presented at the Second International Pawpaw Conference held September 21-22, 2001, Frankfort, Kentucky. Includes references"