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Title: POTENTIAL RED MORNINGGLORY (IPOMOEA COCCINEA) RESISTANCE TO ATRAZINE

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

Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 1/27/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Laboratory and greenhouse studies were conducted to determine if atrazine resistant red morningglories are present in Louisiana. Seed were collected from 20 commercial sugarcane fields in 8 parishes where red morningglory control failures were reported. In addition, seed were collected from four locations not in agronomic production and with no prior history of atrazine use. Leaf sections, 10 mm in diameter, were removed from greenhouse-grown plants at the 5 to 7 leaf stage and floated in a 0.001 M atrazine + 0.01% nonionic surfactant solution for 30 min. Terminal fluorescence from the leaf sections was determined after 10 sec of illumination with measurements continuing at 30-min intervals until terminal fluorescence peaked. Based on initial fluorescence levels and changes in terminal fluorescence following exposure to atrazine, it would appear that these red morningglory populations are not genetically resistant to atrazine. In a greenhouse study, plants treated 10 days earlier with a postemergence application of atrazine at 1.1 kg/ha were controlled at least 99%, supporting the results from the fluorescence assay.