Sensibilidade de plantas de café micorrizadas à herbicidas

Carvalho, Frédéric A.; França, André Cabral; Franco, Miguel Henrique Rosa; Avelar, Moises de; Moreira, Samuel Dias; Alecrim, Ademilson de Oliveira; Santos, José Barbosa dos

doi:10.7824/rbh.v13i2.226

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…In the same way, Ronchi (2003) used the herbicide Clethodim and observed selectivity of this chemical group to coffee seedlings, thus corroborating the results found in this study. Carvalho et al (2014) studied the herbicide Fluazifop-p-butyl in coffee seedlings with and without inoculation of arbuscular mycorrhizal fungi, and observed 'Catuaí IAC 99' selectivity at the herbicide package-insert dose. However, the same authors observed that, when mixed with the herbicide Fomesafen, there are growth losses in coffee plants.…”

Section: Resultsmentioning

confidence: 99%

Selectivity of Fluazifop-P-Butyl in Young Coffee Plants

Voltolini

Castanheira

Netto

et al. 2019

C.Sci.

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Weed control is fundamental in coffee cultivation due to their big interference, competing with the crop for water, light and nutrients. Among the control methods used, chemical control is highlighted, as a function of its high efficiency and low cost. However, due to application failures, herbicide drift phytotoxicity is common. Aiming at the search for selective active ingredients in coffee plants, the objective of this study was to evaluate the selectivity of the active ingredient Fluazifop-p-butyl in young coffee plants, and its effects on plant morphology, anatomy and physiology. The experiment was carried out in a greenhouse, with ‘Topázio MG 1190’ coffee plants (<em>Coffea arabica</em> L.), cultivated in pots with a capacity of 11 L substrate. The statistical design was randomized block design (RBD), with four replications and four doses of the herbicide, making up 16 experimental plots. Each plot consisted of three plants. The treatments were: 0%; 50%; 100% and 200% of the recommended commercial dose of the herbicide Fluazifop-p-butyl. The evaluations were performed at 120 days after application of the treatments. Morphological, physiological and anatomical characteristics were evaluated. Regardless of the evaluated characteristic, there was no difference between the doses of the herbicide. There were no visual phytotoxicity symptoms in the young coffee plants that received the herbicide Fluazifop-p-butyl. The growth of the coffee plants, as well as the physiological and anatomical characteristics, were not altered due to the application of the herbicide Fluazifop-p-butyl.

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Section: Resultsmentioning

confidence: 99%

Selectivity of Fluazifop-P-Butyl in Young Coffee Plants

Voltolini

Castanheira

Netto

et al. 2019

C.Sci.

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“…In addition, due to the contact effect of PPO-inhibitors, even if injuries occur, new leaves are not affected after application (Oliveira Junior, 2011;Silva et al, 2019), which explains the recovery of coffee plants to the application saflufenacil alone at 49 DAA The association of saflufenacil with other herbicides is necessary to increase the spectrum of weed control (Agostineto et al, 2016;Grossmann et al, 2011;Jhala;Ramirez;Singh, 2013). Although there may be antagonisms between PPO-inhibiting and ACCase-inhibiting (Rodrigues;Almeida, 2018;Rustom et al, 2019), our results showed that sethoxydim potentiated the effect of saflufenacil, when compared to the isolated application, In addition, sethoxydim with systemic translocation and action in meristematic regions, prolonged the effect of saflufenacil, configuring a harmful factor to growing coffee trees.In the same way Carvalho et al (2014), observed that coffee seedlings showed symptoms of phytotoxicity to fomesafen (PPO) mixed with flauzifop-p-buthyl (ACCase), the same effect not occurring in isolated applications of these herbicides.…”

Section: Phytotoxicity Assessmentmentioning

confidence: 79%

“…As they are young plants, the initial development stage, contributed to the resultsof the applications of saflufenacil alone and in association. Considering that plants with 2 -6 pairs of leaves are more sensitive to PPO-inhibiting herbicides, due to the greater leaf wetness and greater penetration due to the lower deposition of cuticular wax (Carvalho;Netto, 2016;Gonçalves;Carvalho, 2017). According to Oliveira Junior (2011); Silva et al (2017a), plants considered tolerant to PPO inhibitors, can present injuries, from moderate to severe, and that drift with small drops cause the appearance of small white spots on the leaves after application in post-emergence.…”

Section: Phytotoxicity Assessmentmentioning

confidence: 99%

“…In direct contact with the leaves, the protoporphyrinogen oxidase (PPO) inhibiting herbicides are few selective (Oliveira Junior, 2011). Some PPO-inhibiting herbicides, alone and in association, can cause damage such as reduced growth in young coffee trees (Carvalho et al, 2014;Silva et al, 2017a). Gonçalves et al (2016) showed the selective potential of saflufenacil alone and in association with glyphosate when applied to the ground.However, the heterogeneity and the difficulty in controlling the weed species found in coffee farming drive the need for selectivity research on more herbicide molecules and associations between them.…”

Section: Introductionmentioning

confidence: 99%

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Phytotoxicity and leaf anatomy of young coffee plants subjected to herbicides exclusively and in associations

almeida

Gonçalves

Netto

et al. 2020

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The lack of work force and the damage that weeds can cause to coffee plants are the causes of the growing demand for selective herbicides to be used in coffee farming. Thus, the objective of this study was to evaluate the phytotoxicity symptoms and leaf anatomical characteristics of young coffee plants submitted to application isolated herbicides and also in associations. An experiment was carried out in a protected environment in randomized blocks: four replicates with coffee seedlings (Coffea arabica L.) cultivar "Topázio MG-1190", grown in pots with a capacity of 11 liters of substrate. The herbicides applied, in isolation, were: pyrazosulfuron-ethyl (0.015 kg ha-1), saflufenacil (0.049 kg ha-1), imazetaphyr (0.1 kg ha-1), iodosulfuron-methyl (0.0035 kg ha-1), chlorimuron-ethyl (0.015 kg ha-1) and sethoxydim (0.184 kg ha-1). The latter was used in associations with the others. In addition, a control without herbicides was used. Phytotoxicity symptoms were evaluated up to 49 days after application (DAA) and anatomical characteristics at 65 DAA. Saflufenacil exclusively and inassociation with sethoxydim caused visual phytotoxicity symptoms in the leaves and negatively influence in the characteristics of the epidermis thickness of the adaxial face (EAD), thickness of the palisade parenchyma (PAP), thickness of the spongy parenchyma (SPP) and thickness of the mesophyll (MES). The other herbicides, isolated or in associations, didn't cause phytotoxicity symptoms, but had negative influence in the anatomical parameters of the leaf blade. However they did not interfere with the paradermic parameters and the vascular bundle.

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“…Herbicide effect depends on many factors, including plant physiology, environmental conditions, application conditions etc., and those factors also influence each other (CARVALHO 2013). Air temperature (an environmental condition) can affect, for example, both plant physiology and herbicide properties.…”

Section: Leonardo Bianco De Carvalhomentioning

confidence: 99%

Breaking apple dormancy using thidiazuron and air temperature effect on herbicide efficiency for ryegrass control

Carvalho

2017

Rev. Ciên. Agrovet.

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Thidiazuron can be used to promote sprouting induction in apples, found DE MARTIN et al. (2017). Authors concluded that the application of thidiazuron on 'Daiane' apples with a concentration of 125 and 250 mg L -1 , added to mineral oil (3.5%), is a viable alternative to break gem dormancy with no negative impact on fruit production. The use of chemicals to break gem dormancy in apples is important if winter temperatures are not sufficiently low for dormancy overlapping (FRANCESCATTO 2014). The most common chemical used is hydrogen cyanamide, but it can be toxic for humans, especially for the applicators (HAWERROTH et al. 2010). Thus, this study reveals a less toxic alternative to break gem dormancy in 'Daiane' apples, guaranteeing similar production to the most commonly used chemical.The air temperature at the moment of herbicide spraying affects the efficiency of the chemical control of Italian ryegrass, found PEREIRA et al. (2017). Authors concluded that many grass killers are more efficient if application occurs at 20-22 o C. In addition, applications under temperatures of 30-34 o C are negatively affected, reducing the chemical control of ryegrass; moreover, the response can also be different among biotypes. Herbicide effect depends on many factors, including plant physiology, environmental conditions, application conditions etc., and those factors also influence each other (CARVALHO 2013). Air temperature (an environmental condition) can affect, for example, both plant physiology and herbicide properties. As herbicide absorption (also translocation and metabolism) is fundamental to herbicide action in plants, any factor affecting the movement of a plant killer into plant cells influences the chemical toxic action. Thus, the interaction among those factors is difficult to measure, so that any information on isolated effects is fundamental to establish efficient weed control programs. Universidade Estadual Paulista, Jaboticabal, SP, Brasil. REFERENCES

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Sensibilidade de plantas de café micorrizadas à herbicidas

Cited by 6 publications

References 3 publications

Selectivity of Fluazifop-P-Butyl in Young Coffee Plants

Selectivity of Fluazifop-P-Butyl in Young Coffee Plants

Phytotoxicity and leaf anatomy of young coffee plants subjected to herbicides exclusively and in associations

Breaking apple dormancy using thidiazuron and air temperature effect on herbicide efficiency for ryegrass control

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