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Poster Presentations

Poster Presentations


Tracking soybean rust-susceptible kudzu in Mississippi

Presenter: T. W. Allen

All authors and affiliations: T. W. ALLEN (1), M. R. Bonde (2), W. F. Moore (3), A. R. Milling (3), M. L. Broome (3), J. Bridgers (4). (1) Mississippi State University, Stoneville, MS; (2) USDA-ARS, Frederick, MD; (3) Mississippi State University, Mississippi State, MS; (4) Jimmy Sanders, Inc., Tchula, MS

It is estimated that Mississippi contains more than 101,000 hectares of kudzu. Based on extensive surveys conducted since soybean rust (SBR) was first detected in Mississippi, we determined that 80 counties contain kudzu. Following a recent publication on kudzu reactions to greenhouse challenge with three geographically distinct isolates of Phakopsora pachyrhizi, it was determined that 7.8% of the Mississippi kudzu sites screened exhibited an immune response. An immune response was defined as a red-brown lesion type without the characteristic raised pustules. During October 2009, surveys were conducted to determine the response of the 51 screened kudzu sites and more than 100 additional sites to natural infection from P. pachyrhizi. The information gathered will help us more carefully focus our kudzu scouting efforts in the future and potentially allow us to determine the extent of immune kudzu. In all, greater than 80% of the sites surveyed exhibited symptoms and signs of SBR. Additionally, it appears that there may be morphological differences between kudzu plants with different responses to P. pachyrhizi. Moreover, based on observational and greenhouse data, there are several different types of susceptible responses within the kudzu population to P. pachyrhizi. Additionally, kudzu sites previously identified as being immune to the fungus in the greenhouse and not currently exhibiting symptoms or signs of SBR can likely serve as differentials in the future should P. pachyrhizi make a molecular shift.

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