Title: Mycotoxin Levels and Aspergillus flavus Colonization of Corn and Soybean Under Different Cropping Sequences Authors
Submitted to: Multicrop Aflatoxin and Fumonisin Elimination and Fungal Genomics Workshop-The Peanut Foundation
Publication Type: Abstract Only
Publication Acceptance Date: October 21, 2007
Publication Date: October 21, 2007
Citation: Bruns, H.A., Abbas, H.K., Zablotowicz, R.M. 2007. Mycotoxin Levels and Aspergillus flavus Colonization of Corn and Soybean Under Different Cropping Sequences. Multicrop Aflatoxin and Fumonisin Elimination and Fungal Genomics Workshop-The Peanut Foundation. October 22 - 24, 2007, Atlanta, Georgia. 2007 CDROM Technical Abstract: A four year field experiment was initiated in 2005 to determine the effects of eight corn (Zea mays L.)-soybean (Glycine max L. Merr.) rotation schemes on aflatoxin and fumonisin contamination of the crops and colonization of the grain by Aspergillus flavus. Both the corn hybrid and soybean cultivar are glyphosate resistant and furrow irrigated. Aflatoxin levels in soybean averaged 2.3 and < 0.5 ppb in 2005 and 2006, respectively, while higher levels (P< 0.05 ) were found in corn 16.7 ppb and 37.1 ppb (2005 and 2006, respectively). A. flavus colonization was greater in corn (log 1.9 cfu g-1) compared to soybean < 1.3 cfu g-1 in 2005. In 2006 similar colonization was observed among both crops (~log 3.3 cfu g-1). A higher frequency of aflatoxigenic A. flavus isolates were associated with corn compared to soybean in both years. Higher levels of fumonisin contamination were found in corn (2.6 ppm and 0.9 ppm in 2005 and 2006, respectively) compared to soybean <0.2 ppm in both years. The experiment has not completed a full sequence of rotation treatments and thus complete assessment of alternate cropping systems on mycotoxin contamination is not yet possible.