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Louisiana State University

Theses/Dissertations

2011

Soybean

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Use Of Harvest Aid In Soybean: Application Timing, Economics And Interactions In Ipm Programs, Joseph Michael Boudreaux Jan 2011

Use Of Harvest Aid In Soybean: Application Timing, Economics And Interactions In Ipm Programs, Joseph Michael Boudreaux

LSU Master's Theses

Indeterminate and determinate soybean (Glycine max (L). Merr.) cultivars were treated with the harvest aids, paraquat and sodium chlorate, when moisture of seed collected from the uppermost four nodes of plants averaged 60, 50, 40, 30, and 20% (+ or - 2%). Harvest aid application at 60% seed moisture reduced yield of the Maturity Group (MG) IV indeterminate cultivar 15%, but yield was not affected with application at 50% seed moisture. For MG V and MG VI determinate cultivars, application at 60 and 50% seed moisture reduced yield 4 to 22%, but yield was not affected when harvest aid was …


Simplicillium Lanosoniveum, A Mycoparasite Of Phakopsora Pachyrhizi And Its Use As A Biological Control Agent, Nicole A. Ward Jan 2011

Simplicillium Lanosoniveum, A Mycoparasite Of Phakopsora Pachyrhizi And Its Use As A Biological Control Agent, Nicole A. Ward

LSU Doctoral Dissertations

In 2007, a filamentous fungus was recovered from sori of soybean rust (SBR), caused by Phakopsora pachyrhizi, collected from Louisiana and Florida. This fungus was identified as Simplicillium lanosoniveum on the basis of ITS sequence data and morphological traits. Simplicillium lanosoniveum was found coiling within sori and around urediniospores and showed a trophic attraction to rust sori, extending from sorus to sorus. In co-inoculated soybean leaves, the fungus did not grow or establish on leaf surfaces until sori erupted. Similarly, S. lanosoniveum colonized within 3 days and sporulated within 4 days on leaves showing disease symptoms. In field studies, when …