Adequacy of glyphosate doses in the Merremia cissoides (Lam.) Hallier f. control as a function of light intensity in the growth environments

Shading interferes with the weed's biology, which can change their sensitivity to post-emergence herbicides. The objective was to evaluate the control of Merremia cissoides with glyphosate in full sunlight and shade conditions in two plant growth stages (30 and 73 days after sowing (DAS)). At 3...

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Published in:Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2022, Vol.57 (12), p.960-969
Main Authors: Ferreira, Guilherme A. P., Donato, Luan M. S., Souza, Richardson F., Montes, William G., Vaz, Valter, Tuffi Santos, Leonardo D.
Format: Article
Language:English
Subjects:
Adequacy
Convolvulaceae
Dose reduction
Electron transport
electron transport rate
Environmental impact
Glycine - pharmacology
Glyphosate
Growth stage
herbicide
Herbicides
Herbicides - pharmacology
Light intensity
Luminous intensity
Merremia cissoides
Photosystem II
Plant growth
Plant Leaves
quantum yield of photosystem II
roadside woodrose
Shading
Sunlight
Transport rate
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Summary:Shading interferes with the weed's biology, which can change their sensitivity to post-emergence herbicides. The objective was to evaluate the control of Merremia cissoides with glyphosate in full sunlight and shade conditions in two plant growth stages (30 and 73 days after sowing (DAS)). At 30 and 73 DAS, treatments were established in a 2 × 5 and 2 × 6 factorial scheme, respectively. In both experiments, the growth environments constituted the first factor, and the glyphosate doses the second factor. Shading promoted 50 and 40% reductions in glyphosate doses at 30 and 73 DAS, respectively. At 73 DAS, M. cissoides is 177.77 and 131.48% more tolerant to glyphosate than 30 DAS in shading and full sunlight, respectively. Due to the increase in glyphosate tolerance as the plant grows, the management of M. cissoides should be carried out until the stage of six fully expanded leaves. Increasing glyphosate doses reduced the quantum yield of photosystem II and electron transport rate (ETR) in both growth environments, with ETR data showing a high negative correlation with the control. The doses reductions promoted by shading and glyphosate application in the initial growth stage of M. cissoides reduces costs and the negative environmental impacts of this herbicide use.
ISSN:0360-1234
1532-4109
DOI:10.1080/03601234.2022.2151790