Lynn M. Sosnoskie1, Theodore M. Webster2, and A. Stanley Culpepper1. (1) University of Georgia, 4604 Research Way, UGA, Tifton, GA 31794, (2) USDA-ARS, Crop Protection and Management Research Unit, Tifton, GA 31793
In 2004, a cotton grower in Macon County, Georgia, was unable effect season-long control of a population of A. palmeri in the field using recommended rates of glyphosate. Additional studies determined that individual A. palmeri plants from this location are 6-8 fold more tolerant to glyphosate as compared to a known susceptible population. Because A. palmeri is wind-pollinated, there is concern that the glyphosate-resistance trait is being disseminated abiotically. The probability of a successful germination event occurring at any given distance from the pollen source is dependant upon the performance of pollen grains post-anthesis. Although many authors have shown that the functional life of pollen decreases over time, there have been no studies describing how pollen of weedy species, such as A. palmeri, are affected by environmental conditions. During this talk, we will discuss how temperature and humidity influence A. palmeri pollen longevity.
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