Impact of Climate Change Factors on Weeds and Herbicide Efficacy

Varanasi, Aruna; Prasad, P. V. Vara; Jugulam, Mithila

doi:10.1016/bs.agron.2015.09.002

Cited by 182 publications

(158 citation statements)

References 121 publications

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“…3). Environmental factors such as temperature, light, moisture, and relative humidity may have differentially affect the uptake, translocation, and activity of herbicides (Varanasi et al, 2016). 3).…”

Section: Weed Biomassmentioning

confidence: 99%

“…However, herbicide efficiency on weed biomass was variable among the site-years (data not shown). Environmental factors such as temperature, light, moisture, and relative humidity may have differentially affect the uptake, translocation, and activity of herbicides (Varanasi et al, 2016). Also, environmental variations (Table 2) and stubble management such as chem fallow in Leth15 and barley silage stubble in Leth16 compared with wheat stubble in all other sites might have contributed to the variation in weed responsible.…”

Section: Weed Biomassmentioning

confidence: 99%

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Agronomic Responses of Brassica carinata to Herbicide, Seeding Rate, and Nitrogen on the Northern Great Plains

et al. 2018

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Brassica carinata A. Braun seeds contain high erucic and linolenic acids that are desirable for biofuel and biopolymer products. However, key agronomic practices to maximize carinata productivity on the Northern Great Plains are not well known. Here, we investigated the response of seed yield and quality to three key agronomic factors—herbicide, seeding rate, and N. The factorial experiment, conducted in nine environments (site‐years) on the Canadian prairies from 2014 to 2016, included two weed control options (weedy vs. weed‐controlled), three levels of N application (low = 32–97 kg N ha−1, medium = 75–198 kg N ha−1, and high = 117–297 kg N ha−1), and five seeding rates (50, 100, 150, 200, and 300 seeds m−2). On average, weed biomass with the herbicide‐applied treatment was 245 kg dry matter ha−1, significantly lower than the 1338 kg dry matter ha−1 with the non‐herbicide treatment, leading to 37% greater seed yield. In four of the nine environments, medium and high N fertilizer rates increased seed yield by 29 and 45%, respectively, compared with the low‐N treatment, but N fertilizer did not affect yield in the remaining five environments. Increasing seeding rates decreased weed biomass and increased seed yield. Seed oil and protein contents ranged from 37.2 to 48.5% and 22.6 to 36.3%, respectively, and these two traits had an inverse linear relationship. These results demonstrate that carinata may be well adapted to the Northern Great Plains as an alternative oilseed crop, and that seed yield and quality responses to key agronomic factors can vary with environmental conditions.

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Section: Weed Biomassmentioning

confidence: 99%

Section: Weed Biomassmentioning

confidence: 99%

Agronomic Responses of Brassica carinata to Herbicide, Seeding Rate, and Nitrogen on the Northern Great Plains

et al. 2018

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“…Climate change not only affects the biology of weeds and their interference ability, but it also impacts the efficacy of certain weed management strategies. 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 .…”

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

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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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“…Isso talvez seja explicado pelo produto ser sistêmico e pelo metabolismo destas plantas daninhas serem diferentes (Varanasi et al, 2016). Capim-braquiária é uma planta C 4 .…”

Section: Resultsunclassified

“…As plantas C 4 perdem em torno de 100 moléculas de H 2 O por molécula de CO 2 fixada enquanto que as plantas C 3 perdem em torno de 600 moléculas de H 2 O por molécula de CO 2 fixada (Dietrich et al, 2001). Assim, a maior adaptação à climas áridos, conferida às plantas de mecanismo fotossintético C4, pode ser explicada à sua maior condutância mesofílica, que por sua vez, resultam em menor condutância estomática e maior eficiência no uso da água (Varanasi et al, 2016).…”

Section: Introductionunclassified

Efeito do paraquat e glyphosate sobre espécimes de poaceae e convolvulaceae em condições de déficit hídrico

et al. 2017

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Resumo -O uso de herbicidas é uma prática muito utilizada para o controle de plantas daninhas. Entretanto, sua eficácia pode ser comprometida pela menor disponibilidade de água no ambiente, influenciando na absorção, translocação e metabolismo destes pelas plantas. O presente trabalho objetivou estudar o efeito dos herbicidas paraquat (Gramoxone  ) e glyphosate (Roundup Original  ) para o controle de capim-braquiária [Urochloa decumbens (Stapf) R.D.Webster (Poaceae)] e corda-de-viola [Merremia cissoides (Lam.) Hallier f. (Convolvulaceae)], em condições de déficit hídrico. O experimento foi conduzido em casa de vegetação, em delineamento experimental inteiramente casualizado e esquema fatorial 5×3, com três repetições. Foram consideradas cinco épocas de indução de déficit hídrico (0, 1, 3, 5 e 7 dias) e três caldas de pulverização [paraquat, glyphosate e testemunha (com a aplicação de água, apenas)]. As avaliações de porcentagem de controle foram realizadas aos 2, 5, 7, 10, 14 e 21 dias após a aplicação dos tratamentos. Aos 21 dias foi determinado o teor de massa seca das plantas daninhas. Pelos resultados obtidos, observou-se que a partir de 5 dias com déficit hídrico, a eficácia dos herbicidas paraquat e glyphosate para o controle de capim-braquiária e corda-de-viola foi reduzida. Palavras-chave: Urochloa decumbens, Merremia cissoides, controle químico, cana-de-açúcarAbstract -The use of herbicides is very used by growers for the control of weeds. However, their effectiveness can be compromised by the reduction of water in the atmosphere, influencing its uptake, translocation and metabolism in plants. The objective of this study was to evaluate the efficacy of herbicides paraquat (Gramoxone  ) and glyphosate (Roundup Original  ) for the control of Urochloa decumbens (Stapf) R. D. Webster (Poaceae) and Merremia cissoides (Lam.) Hallier f. (Convolvulaceae) when submitted to hydric deficit. The experiment was conducted in greenhouse conditions with completely randomized design in factorial 5×3, considering three replicates. It was considered five induction conditions of hydric deficit (0, 1, 3, 5 and 7 days) and three treatments (paraquat, glyphosate and untreated check, only water). The evaluations were performed at 2, 5, 7, 10, 14 and 21 days after treatment application. At 21 days, it was also determined the dry weight of weeds. From the results obtained, it was observed that from 5 days without irrigation the herbicides reduced their effectiveness for the control of weeds.

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Impact of Climate Change Factors on Weeds and Herbicide Efficacy

Cited by 182 publications

References 121 publications

Agronomic Responses of Brassica carinata to Herbicide, Seeding Rate, and Nitrogen on the Northern Great Plains

Agronomic Responses of Brassica carinata to Herbicide, Seeding Rate, and Nitrogen on the Northern Great Plains

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

Efeito do paraquat e glyphosate sobre espécimes de poaceae e convolvulaceae em condições de déficit hídrico

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