Herbicide effectiveness in controlling invasive plants under elevated CO2: Sufficient evidence to rethink weeds management

Waryszak, Paweł; Lenz, Tanja I.; Leishman, Michelle R.; Downey, Paul

doi:10.1016/j.jenvman.2018.08.050

Cited by 35 publications

(28 citation statements)

References 55 publications

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“…On the other hand, several studies reported a significant decrease in glyphosate efficacy under elevated CO 2 citing the enhanced growth and biomass production and morphological adaptations (such as increased leaf thickness) as major reasons for reducing the herbicide toxicity . Ziska et al reported that elevated CO 2 substantially increased the biomass of Cirsium arvense (L.) Scop.…”

Section: Discussionmentioning

confidence: 99%

“…An elevated atmospheric CO 2 concentration has been reported to have a remarkable impact on the efficacy of various herbicides used to control different weed species . Several studies have reported a decline in the herbicide efficacy at elevated CO 2 as compared to the ambient CO 2 concentration . This has been associated with a range of morphological and physiological changes particularly in leaves and generally in other parts of the plants grown under elevated CO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of elevated carbon dioxide concentration on growth, productivity and glyphosate response of parthenium weed (Parthenium hysterophorus L.)

Bajwa

Wang

Chauhan

et al. 2019

Pest Management Science

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BACKGROUND: The rise in atmospheric CO 2 has huge impacts on the biology and management of invasive weed species such as Parthenium hysterophorus. This study evaluated the effect of ambient (400 ppm) and elevated (700 ppm) CO 2 concentrations on P. hysterophorus growth, reproductive output and response to glyphosate applied at several doses including the recommended dose (800 g a.e. ha −1 ). RESULTS: The plants in control treatment (no herbicide) grew taller (41%), produced a larger number of leaves (13%) and flowers (39%), and higher dry biomass (34%) at elevated CO 2 as compared to the ambient CO 2 . Glyphosate caused significant reduction in chlorophyll content of P. hysterophorus plants grown at both CO 2 concentrations in a dose-dependent manner. The percentage herbicide injury was relatively less at elevated CO 2 as compared to the ambient CO 2 at 7 and 14 days after glyphosate application but it was almost similar at 21 days after application. This shows that elevated CO 2 might have slowed the translocation of glyphosate initially, but most plants were killed eventually close to 21 days after application. The survival rate was higher under elevated as compared to the ambient CO 2 at recommended and lower doses of glyphosate. There was a negligible difference between the two CO 2 concentrations for the plant dry biomass reduction over the control treatment. CONCLUSIONS: P. hysterophorus growth and reproductive potential (indicated by number of flowers) improved significantly by CO 2 enrichment but there was little effect on the overall efficacy of glyphosate applied to control this species.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of elevated carbon dioxide concentration on growth, productivity and glyphosate response of parthenium weed (Parthenium hysterophorus L.)

Bajwa

Wang

Chauhan

et al. 2019

Pest Management Science

View full text Add to dashboard Cite

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“…However, weeds represent a major constraint to agricultural activities and are similarly expected to benefit from increases in CO 2 . Increases in the growth and productivity of C 3 weeds, serves to enhance their competitiveness, with studies suggesting that weeds will increasingly outcompete crop plants in the future . Therefore, it is important to understand how elevated CO 2 levels, anticipated in the future, are likely to influence weed management in natural and agrosystems, particularly regarding damaging species such as Parthenium hysterophorus L. (Asteraceae) …”

Section: Introductionmentioning

confidence: 99%

“…The resulting phytotoxic effects include leaf wilting, yellowing, necrosis, and plant death, which typically occur within 1 to 3 weeks of application . Although glyphosate efficacy is highly dependent on the dosage applied, there are concerns that elevated CO 2 will reduce the susceptibility of P. hysterophorus , to herbicides in the future …”

Section: Introductionmentioning

confidence: 99%

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Implications of elevated carbon dioxide on the susceptibility of the globally invasive weed, Parthenium hysterophorus, to glyphosate herbicide

Cowie

Venter

Witkowski

et al. 2020

Pest Management Science

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BACKGROUND The noxious annual herb, Parthenium hysterophorus L. (Asteraceae), is an invasive weed of global significance, threatening food security, biodiversity and human health. In South Africa, chemical control is frequently used to manage P. hysterophorus, however, concern surrounds increasing atmospheric CO2 levels, which may reduce the efficacy of glyphosate against the weed. Therefore, this study aimed to determine the susceptibility of P. hysterophorus to glyphosate (1L/ha: recommended) after being grown for five generations in Convirons under ambient (400 ppm) and elevated (600 and 800 ppm) CO2. RESULTS Glyphosate efficacy decreased with increasing CO2, with mortalities of 100, 83 and 75% recorded at 400, 600 and 800 ppm, respectively. Parthenium hysterophorus experienced enhanced growth and reproduction under elevated CO2, however, glyphosate application was highly damaging, reducing the growth and flowering of plants across all CO2 treatments. Physiologically, glyphosate‐treated plants, in all CO2 treatments, suffered severe declines of >90% in chlorophyll content, maximum quantum efficiency (F v/Fm), photon absorption (ABS/RC), electron transport (ET 0/RC) and performance index (PI ABS), albeit at slower rates for plants grown under elevated CO2. Low levels of recovery from glyphosate were documented only for plants grown under elevated CO2 and was attributed to their increased biomass. CONCLUSION These results suggest that increasing CO2 levels may hinder chemical control efforts used against P. hysterophorus in the future, advocating for further investigation using multigenerational CO2 studies and the maintenance of effective spraying programs at present. © 2020 Society of Chemical Industry

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Climate Change and the Persistence of Weeds

Clements¹,

DiTommaso²

2022

Persistence Strategies of Weeds

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Herbicide effectiveness in controlling invasive plants under elevated CO2: Sufficient evidence to rethink weeds management

Cited by 35 publications

References 55 publications

Effect of elevated carbon dioxide concentration on growth, productivity and glyphosate response of parthenium weed (Parthenium hysterophorus L.)

Effect of elevated carbon dioxide concentration on growth, productivity and glyphosate response of parthenium weed (Parthenium hysterophorus L.)

Implications of elevated carbon dioxide on the susceptibility of the globally invasive weed, Parthenium hysterophorus, to glyphosate herbicide

Climate Change and the Persistence of Weeds

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