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Title: POTENTIAL ATRAZINE RESISTANCE IN RED MORNINGGLORY (IPOMOEA COCCINEA L.) ANDHERBICIDE ALTERNATIVES IN LOUISIANA SUGARCANE

Author
item VIATOR, B - LSU AG CENTER
item GRIFFIN, J - LSU AG CENTER
item WEBSTER, E - LSU AG CENTER
item Richard Jr, Edward

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/25/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Greenhouse and laboratory studies were conducted to determine if atrazine-resistant red morningglories are present in Louisiana using seed collected from commercial fields where red morningglory control failures were reported. All red morningglory populations showed a significant increase in terminal fluorescence when leaf sections were floated on a solution containing 0.001 M atrazine. Analysis of variance indicated small differences in the change in relative fluorescence values, but no differences in initial fluorescence. In the greenhouse, all plants treated with 1.1 kg/ha atrazine + 0.25% nonionic surfactant were controlled 10 days after treatment (DAT) at least 99%. In field studies, red morningglory was controlled 21 DAT at least 84% with atrazine (1.7 kg/ha), diuron (3.4 kg/ha), metribuzin (1.1 kg/ha), terbacil (0.84 kg/ha), sulfentrazone (0.14, 0.28, and 0.42 kg/ha), and azafenidin (0.42, 0.56, 0.71, and 0.84 kg/ha). Control 45 DAT in 1997 with atrazine and terbacil was 84%, while the remaining treatments gave 89 to 100% control. At the same rating date in 1998, maximum control was observed with all rates of sulfentrazone (84 to 90%) and azafenidin at 0.84 kg/ha (87%). The remaining treatments controlled red morningglory 36 to 78%. Data suggest that observed failures in red morningglory control with atrazine are probably associated with the loss in residual control and not to genetic alterations in the red morningglory populations.