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Atrazine Accentuates Carryover Injury from Mesotrione in Vegetable Crops

Published online by Cambridge University Press:  20 January 2017

Darren E. Robinson
Darren E. Robinson*
Affiliation:
Department of Plant Agriculture, University of Guelph, Ridgetown Campus, Ridgetown, Ontario, Canada N0P 2C0
*
Corresponding author's Email: drobinso@ridgetownc.uoguelph.ca.
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Abstract

Trials were established in 2003, 2004, and 2005 in Ontario to determine the effects of residues of mesotrione, atrazine, and mesotrione plus atrazine 1 and 2 yr after application on broccoli, carrot, cucumber, onion, and potato. One yr after mesotrione application, injury was 43, 37, 18, 24, and 0% in broccoli, carrot, cucumber, onion, and potato, respectively. The addition of atrazine to mesotrione in the year before planting increased injury to 55, 53, 30, 42, and 3% in broccoli, carrot, cucumber, onion, and potato, respectively. Plant dry weight and yield were also decreased by mesotrione residues the year after application in all crops except potato. The addition of atrazine to mesotrione accentuated the reduction in dry weight and yield in broccoli, carrot, cucumber, and onion. There was no injury, or reductions in dry weight or yield in any crop planted 2 yr after application of mesotrione alone or in tank mix with atrazine. A recropping interval of 2 yr is recommended following applications of mesotrione or mesotrione plus atrazine for broccoli, carrot, cucumber, and onion. Potato can be safely planted the year following application of mesotrione plus atrazine.

Keywords

Atrazinemesotrionebroccoli, Brassica oleracea var. italica Plenckcarrot, Daucus carota L.cucumber, Cucumis sativus L.onion, Allium cepa L.potato, Solanum tuberosum LHerbicide carryoverherbicide mixturesherbicide residuesrotational crops
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 22 , Issue 4 , December 2008 , pp. 641 - 645
Copyright
Copyright © Weed Science Society of America 

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