Níveis de Desfolha Artificial para Simular Perdas na Produtividade do Feijoeiro Comum

Pratissoli, Dirceu; Schmildt, Edílson Romais; Amaral, José Augusto Teixeira do; Schmildt, Omar

doi:10.18188/1983-1471/sap.v11n3p68-76

Cited by 5 publications

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“…[3] also observed a reduction in the number of pods with 100% of defoliation in cultivar Xamego, but this reduction was more pronounced in R7 (64%) than in R6 (41%). [4] obtained in cultivar Carioca Precoce a reduction of 64.5% and 62.2% of the number of pods in stages R6 and R7, respectively, when defoliation was 100%.…”

Section: Resultsmentioning

confidence: 82%

“…In contrast, [14] observed that the defoliation of 25% in plants with 10 and 17 days of age did not significantly decrease the production, but in plants with more than 24 days of age the defoliation at all levels reduced the production of the bean. Other authors [4] It has been verified a varied behavior of the bean cultivars against simulated defoliation, as reported by [9], for "Carioca" and "Rosinha", [16], for the cultivar "Pérola", [13], for the cultivar "Capixaba Precoce", [13], for the cultivar "Xamego" and [10] for the cultivar "Caupi". However, no information is available on the levels of leaf area reduction of Goytacazes bean, in relation to the defoliation caused mainly by insect pests, which cause significant losses in grain production in the southern state of Espírito Santo.…”

Section: Introductionmentioning

confidence: 65%

“…and Lagria vilosa, and by lepidoptera Hedylepta indicata, Pseudoplusia includens and Urbanus proteus, due to the reduction of leaf area [2] [3]. Also, the reduction of leaf area can also be caused by fungal, bacterial and viral diseases that can cause leaf falls [4].…”

Section: Introductionmentioning

confidence: 99%

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Artificial Defoliation to Simulate Losses on Production of Bean (<i>Phaseolus vulgaris</i> L. cv. Goytacazes)

Schmildt¹,

Oliveira²,

Pratissoli³

et al. 2019

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The reduction of foliar area can cause yield reduction in common bean crops. The objective of this work was to verify which is the effect of different defoliation levels realized in several development stages of common bean (Phaseolus vulgaris L. cv. Goytacazes) over yield, weight of 100 seeds and number of pods per plant. The experimental design was randomized blocks, in a split-plot arrangement with five replications. The plot corresponded to the five defoliation epochs (first trifoliate leaf, flowering, pods formation, pods filling, and dry pods). In each plot, the split plot was represented by the four defoliation levels (0%, 33%, 67% and 100%). It was observed a decrease of yield for all levels defoliation considering all development stages, except for dried pods. The highest decrease was detected for flowering and pods formation. Through the regression analysis got a greater reduction in yield with 100% defoliation made at 42 days after emergence. The evaluation parameter that showed better relation with yield was a number of pods per plant.

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Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 65%

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Artificial Defoliation to Simulate Losses on Production of Bean (<i>Phaseolus vulgaris</i> L. cv. Goytacazes)

Schmildt¹,

Oliveira²,

Pratissoli³

et al. 2019

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“…Studies like Fehr et al (1981) showed that, in cultivars with determinate and indeterminate growth habits, the stage R5 was the most sensitive to defoliation, with losses of 80% in grain yield for a defoliation level of 100%. Studying common beans, Pratissoli et al (2012) report that the highest losses in grain yield occurred with 100% defoliation performed during the stages of flowering and pod filling. In general, the cultivar 'NK 7059RR' showed the highest yield compared with 'NA…”

Section: Resultsmentioning

confidence: 99%

Defoliation percentage in two soybean cultivars at different growth stages

Glier¹,

Júnior

Fachin

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to evaluate the agronomic variables due to the effects of different levels of defoliation in the phenological phases of two soybean cultivars. The experiment was conducted during the 2011/2012 season, in a randomized block design with three replicates, in a 2 x 4 x 5 factorial scheme. Two cultivars were exposed to defoliations of 0, 25, 50, 75 and 100% at the stages of V4, V9, R3 and R5. The cultivar 'NK 7059RR' showed less sensitivity to defoliation than the cultivar 'IN 4990RG' . 25% defoliation levels reduced the yield of the cultivar 'IN 4990RG' , while levels of 75 and 100% reduce the number of grains per pod in both cultivars. The defoliation performed in the V4 stage lead to lower grain yield than defoliation in V9. The most sensitive stages to defoliation are R3 and R5, where there is a greater reduction in the production potential of soybeans.Percentual de desfolha em duas cultivares de soja em diferentes estádios fenológicos R E S U M O Objetivou-se, com este trabalho, avaliar as variáveis agronômicas em função dos efeitos de diferentes níveis de desfolha nas fases fenológicas de duas cultivares de soja. O experimento foi conduzido durante a safra 2011/12 e o delineamento experimental utilizado foi o de blocos casualizados, com três repetições, em esquema fatorial 2 x 4 x 5, ou seja, duas cultivares foram submetidas à desfolha nos estádios V4, V9, R3 e R5 com porcentagens de 0, 25, 50, 75 e 100%. A cultivar 'NK 7059RR' apresentou menor sensibilidade à desfolha do que a cultivar 'NA 4990RG' . Níveis de 25% de desfolha reduziram a produtividade da cultivar 'NA 4990RG' enquanto que níveis de 75 e 100% reduzem o número de grãos por vagem nas duas cultivares. As desfolhas realizadas no estádio V4 acarretam em menor produtividade do que quando realizadas no estádio V9; os estádios mais sensíveis à desfolha são R3 e R5, ocorrendo maior redução no potencial produtivo da soja.

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“…The total grain production in Brazil's 2013/14 crop was 3.45 million tons in an area of 3.36 million hectares, whereas Paraná state had a production of 808,900 tons of grains (Conab, 2015), being the largest domestic producer. However, the crop can be affected by various insects, including Chrysomelidae family coleopterous (Oliveira and Ramos, 2012), especially Diabrotica speciosa and Cerotoma arcuata, known as little cows Pratissoli et al, 2012;Schmildt et al, 2010). In adulthood, these insects reduce the plants leaf area (Quintela and Barbosa, 2014) and it may cause significant decrease in the photosynthetic capacity of the crop, resulting in decreased productivity (Pratissoli et al, 2012;Schmildt et al, 2010;Silva et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Iphimeis dives (Crysomelidae) Beetle occurrence in beans in western Parana State, Brazil

Alves¹,

Nunes²,

Costa³

et al. 2016

Afr. J. Plant Sci.

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Iphimeis dives (Germar, 1824) is a species of beetle from Chrysomelidae family, commonly found in fruit trees, and it is known as a vine defoliator beetle or Green Beetle. In this study, I. dives occurrence in bean (Phaseolus vulgaris L.) is registered in the cities of Assis Chateaubriand and Palotina, western region of Paraná State. This is the first recorded I. dives attack in Brazil's bean crops. The insects were collected when plants w ere betw een the phenological d e v e l o p m e n t s t a g e s V4 /R 5. Although commonly found in fruit trees and some vegetables, this record in bean crop suggests greater attention to this insect because of the damage it may cause in this culture.

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Níveis de Desfolha Artificial para Simular Perdas na Produtividade do Feijoeiro Comum

Cited by 5 publications

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Artificial Defoliation to Simulate Losses on Production of Bean (<i>Phaseolus vulgaris</i> L. cv. Goytacazes)

Artificial Defoliation to Simulate Losses on Production of Bean (<i>Phaseolus vulgaris</i> L. cv. Goytacazes)

Defoliation percentage in two soybean cultivars at different growth stages

Iphimeis dives (Crysomelidae) Beetle occurrence in beans in western Parana State, Brazil

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Níveis de Desfolha Artificial para Simular Perdas na Produtividade do Feijoeiro Comum

Cited by 5 publications

References 0 publications

Artificial Defoliation to Simulate Losses on Production of Bean (&lt;i&gt;Phaseolus vulgaris&lt;/i&gt; L. cv. Goytacazes)

Artificial Defoliation to Simulate Losses on Production of Bean (&lt;i&gt;Phaseolus vulgaris&lt;/i&gt; L. cv. Goytacazes)

Defoliation percentage in two soybean cultivars at different growth stages

Iphimeis dives (Crysomelidae) Beetle occurrence in beans in western Parana State, Brazil

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Product

Resources

About

Artificial Defoliation to Simulate Losses on Production of Bean (<i>Phaseolus vulgaris</i> L. cv. Goytacazes)

Artificial Defoliation to Simulate Losses on Production of Bean (<i>Phaseolus vulgaris</i> L. cv. Goytacazes)