Efeito do protetor dietholate na seletividade de clomazone em cultivares de arroz irrigado

Sanchotene, Danie Martini; Kruse, Nelson Diehl; Avila, Luis Antônio de; Machado, Sérgio Luiz de Oliveira; Dornelles, Sylvio Henrique Bidel

doi:10.1590/s0100-83582010000200013

Cited by 14 publications

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References 14 publications

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“…One reason for the high selectivity performed by herbicides evaluated may have been treating seeds with the safener dietholate, which is known to be used in protecting cotton seeds against clomazone (Yazbek Júnior and Foloni, 2004). It is known that dietholate inhibits cytochrome P-450 mono-oxygenase, responsible for the activation of clomazone, since this one has no herbicide activity and is considered a pre-herbicide as it needs to be activated for the 5-keto form of clomazone, which is the metabolite of clomazone with activity in weed control (Sanchotene et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

Seletividade dos herbicidas fomesafen e clomazone associados com outros herbicidas aplicados em pré-emergência do algodoeiro

Neto

Constantin²,

Oliveira³

et al. 2015

RBHerbicidas

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-A field experiment was conducted in Santa Helena de Goiás to evaluate the selectivity of herbicides fomesafen and clomazone and other combinations to cotton plants when applied in preemergence. The experiment was conducted in a randomized block design in a split plot design with four replications. The assessed herbicide treatments were: clomazone, clomazone + fomesafen (0.45 kg ha -1 of a.i.), clomazone + fomesafen (0.625 kg ha -1 of a.i.), clomazone + fomesafen + diuron, clomazone + fomesafen + prometryn, clomazone + fomesafen + trifluralin and clomazone + fomesafen + s-metolachlor. The visual symptoms of phytotoxicity were seen up to the evaluation of 19 days after emergence, and generally the injuries were higher where it was associated with three herbicides in the application. The treatments with clomazone alone and the associations clomazone + fomesafen (1.0 + 0.45 kg ha -1 of a.i.), clomazone + fomesafen + diuron, clomazone + fomesafen + prometryn, clomazone + fomesafen + trifluralin and clomazone + fomesafen + smetolachlor were selective to cotton plant. The highest dose of fomesafen (0.625 kg ha -1 of a.i.) in associations with clomazone (1.0 kg ha -1 of a.i.) was not selective to cotton plant (cultivar DP 555 BG RR and in a clayey textured soil, with 3.1% of OM and pH of 6.0). Keywords: chemical control; Gossypium hirsutum r. Latifolia; tank mix Resumo -Um experimento de campo foi realizado em Santa Helena de Goiás para avaliar a seletividade dos herbicidas fomesafen e clomazone e outras associações ao algodoeiro, quando aplicados em pré-emergência. O experimento foi conduzido em delineamento de blocos casualizados em esquema de parcelas subdivididas, com quatro repetições. Os tratamentos herbicidas avaliados foram: clomazone, clomazone + fomesafen (0,45 kg ha -1 de i.a.), clomazone + fomesafen (0,625 kg ha -1 de i.a.), clomazone + fomesafen + diuron, clomazone + fomesafen + prometryn, clomazone + fomesafen + trifluralin e clomazone + fomesafen + s-metolachlor. Os sintomas visuais de fitointoxicação foram visualizados até a avaliação de 19 dias após a emergência, e de modo geral, as injúrias foram maiores onde foi associado três herbicidas na aplicação. Os tratamentos com clomazone isolado e as associações clomazone + fomesafen (1,0 + 1 Received for publication on 20/08/2015 and approved on 14/10/2015.

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Section: Resultsmentioning

confidence: 99%

Seletividade dos herbicidas fomesafen e clomazone associados com outros herbicidas aplicados em pré-emergência do algodoeiro

Neto

Constantin²,

Oliveira³

et al. 2015

RBHerbicidas

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“…Com a inibição dessa enzima, não há ativação do clomazone, não havendo assim formação do herbicida ativo e, consequentemente, dano à planta (SANCHOTENE et al, 2010). No caso de plantas tratadas com acetato de zinco apresentar baixos sintomas de fitointoxicação está relacionada com a atuação do Zinco (Zn) na detoxicação celular, na formação e manutenção da integridade da membrana, parede celular e na regulação e atividade hormonal (MALAVOLTA; VITTI; OLIVEIRA, 1997).…”

Section: Resultsunclassified

“…Contudo, as poucas opções de herbicidas seletivos aplicados em pré-emergência ao algodoeiro para manejo de plantas daninhas, frequentemente, levam a aplicações de herbicidas que resultam em alta toxidez e baixa qualidade de fibra e rendimento do algodão em caroço (SNIPES; SEIFERT, 2003).…”

Section: Introductionunclassified

Seletividade do clomazone em sementes de algodão tratadas com dietholate e acetato de zinco

et al. 2014

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ResumoO presente trabalho objetivou avaliar a seletividade do herbicida clomazone aplicado em pré-emergência em sementes de algodão tratadas com dietholate e acetato de zinco. Foi adotado o esquema fatorial 4 x 2 (4 métodos de tratamento de sementes e 2 doses de clomazone), distribuído no delineamento de blocos casualizados, com 4 repetições. Nos tratamentos em que foram aplicados dietholate e acetato de zinco, foram utilizadas as doses de 0,4 kg ha -1 e 8 mL por kg de sementes, respectivamente. As doses de clomazone utilizadas referem-se a 0,8 e 1,0 kg ha -1 . A cultivar de algodão utilizada foi a Fiber Max 966 LL. Independentemente do tratamento, todas as sementes foram tratadas com o inseticida tiametoxam e o fungicida fludioxonil + metalaxyl-M nas doses de 2,24 e 0,08 + 0,03 g por kg de sementes, respectivamente, visando o controle de pragas iniciais e dos prejuízos causados por patógenos na germinação e na emergência de plântulas. O tratamento com dietholate e acetato de zinco proporcionou maior vigor inicial às plantas de algodão aos 21, 30 e 45 dias após a aplicação. No tratamento com dietholate e acetato de zinco não foi constatado nenhum sintoma de fitointoxicação ao longo das avaliações. As sementes tratadas com dietholate, dietholate e acetato de zinco ou acetato de zinco isoladamente, proporcionaram maior número de capulhos e maior produção de algodão em caroço, em relação à testemunha. Palavras-chave: Fitointoxicação, Gossypium hirsutum, produtividade AbstractThe objective of this study objective was to evaluate the selectivity of pre-emergence applications the herbicide clomazone cotton seeds treated with dietholate and zinc acetate. The 4 x 2 factorial arrangement was adopted (4 seed treatment methods and 2 clomazone dosages), distributed in a randomized block design with 4 repetitions. In treatments where dietholate and zinc acetate were applied, rates of 0.4 kg ha -1 and 8 ml per kg of seeds were used respectively. The clomazone rates used refer to 0.8 and 1.0 kg ha

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“…This result is possibly explained by the development stage that plants received the herbicide (stolons between 20 and 30 cm) because the main form of absorption of clomazone is radicular. Therefore, when applied in preemergence, this herbicide has higher efficiency (Sanchotene et al, 2010).…”

Section: Experiments Imentioning

confidence: 99%

Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

et al. 2018

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-The maximum biological efficiency of a herbicide is performed when the plants are in favorable condition to absorb and metabolize it. Stress situations, such as total submersion, cause stress in plants, reducing weed control efficiency and crop yield. The objective of this study was to verify whether different soil water content and herbicide treatments alter the components of the secondary metabolism and cause cellular damage in weed species Two experiments were conducted (I and II) in a completely randomized experimental design with a factorial scheme (2 x 2 x 4 and 2 x 5, respectively) and three replicates. The first experiment was conducted with two species (Leersia hexandra and Luziola peruviana), which were submitted to four herbicide treatments and soil moisture levels (field capacity and total submersion). Experiment II was performed with cockspur grass plants submitted to five herbicide treatments and the same soil moisture levels from experiment I. Leaf samples were collected for laboratory analyses seven days after establishing the soil moisture levels. Assessmentes were made for the levels of chlorophyll and carotenoids, activity of antioxidant enzymes, as well as levels of hydrogen peroxide and cellular damage. The results showed that all plant species studied showed higher oxidative stress under field capacity than under submersion. L. hexandra shows greater oxidative stress than L. peruviana regardless of the treatment applied: water regime or herbicide. Furthermore, the associations of glyphosate + clomazone and glyphosate + mixture of imazapyr + imazapic caused greater oxidative stress in L. hexandra and L. peruviana than glyphosate alone. All herbicides caused lipid peroxidation, reduced enzyme activity decreased concentrations of total chlorophyll, chlorophyll a and carotenoids on cockspur grass. Keywords: Luziola peruviana, Leersia hexandra, Echinochloa crus-galli,oxidative stress, chemical control. RESUMO -

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Efeito do protetor dietholate na seletividade de clomazone em cultivares de arroz irrigado

Cited by 14 publications

References 14 publications

Seletividade dos herbicidas fomesafen e clomazone associados com outros herbicidas aplicados em pré-emergência do algodoeiro

Seletividade dos herbicidas fomesafen e clomazone associados com outros herbicidas aplicados em pré-emergência do algodoeiro

Seletividade do clomazone em sementes de algodão tratadas com dietholate e acetato de zinco

Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

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