Fipronil residual content in the soil for the control of Oryzophagus oryzae in subsequent flooded rice crops

Martins, José Francisco da Silva; Mattos, M. L. T.; Silva, Fernando Felisberto da; Büttow, G. T.

doi:10.1590/s0100-204x2017000400002

Cited by 9 publications

(10 citation statements)

References 12 publications

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“…This class are among the most widespread insecticidal molecules in agricultural use. In the ST treatment, the insecticide molecule was fipronil, a pyrazole, which has a contact and ingestion mode of action (Martins et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Physiological and enzymatic monitoring of treated seeds of cultivars soybean during storage

Carvalho

Penido

Rocha

et al. 2022

Agraria

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The objective was to analyze the influence of industrial soybean seed treatments on physiological quality throughout the storage and to evaluate the worth of the alcohol dehydrogenase (ADH) enzyme as a marker for quality monitoring. The statistical design used was completely randomized in a 2 × 5 × 5 factorial schemes involving two cultivars, five phytosanitary treatments, and five evaluation periods during storage. Before treatment, the lignin content of the seed coat of the cultivars was analyzed. The physiological quality was evaluated by the first count of germination and the germination, and the ADH enzyme was also quantified. The deterioration of soybean seeds during storage was directly linked to the type of molecule and the viscosity of the spray solution used in the treatment of seeds. The treatment of soybean seeds with predominantly aqueous solution and the use of systemic insecticidal molecules, combined with fungicides and polymers, impaired the germination of the stored seeds, and the deleterious effects became greater over time. ADH has potential as a marker of the physiological quality of treated and stored soybean seeds.

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Section: Resultsmentioning

confidence: 99%

Physiological and enzymatic monitoring of treated seeds of cultivars soybean during storage

Carvalho

Penido

Rocha

et al. 2022

Agraria

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“…In this sense, it is evident that the ET for O. oryzae , currently considered to be five larvae per sample (plant, soil and roots) in Brazil, 15 is underestimated, as it corresponds to ≈50% of the tolerance capacity of rice plants, which is around ten larvae per plant, as defined in this study. The adoption of an underestimated ET has led to the excessive use of insecticides aimed at controlling O. oryzae in Brazil and, consequently, to an unnecessary increase in the cost of production and cases of environmental contamination and effects on nontarget organisms 6 . Thus, the information presented here can provide opportunities for reducing the use of insecticides, increasing profitability and facilitating environmental safety.…”

Section: Discussionmentioning

confidence: 97%

Differential response to the South American rice water weevil (Coleoptera: Curculionidae) damage of rice cultivars with contrasting levels of resistance: implications for field management

Pazini

Grützmacher

Seidel

et al. 2022

Pest Management Science

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BACKGROUND: Oryzophagus oryzae (Costa Lima) (Coleoptera: Curculionidae) is a major pest of flooded rice paddies throughout South America, and species with very similar life histories are present in many rice-producing regions of the world (collectively rice water weevils, RWWs). The damage caused by RWW larvae on rice cultivars with contrasting levels of resistance ('BRS Pampa CL'= 'Pamp': susceptible, 'BRS Atalanta' = 'Atal': resistant-antibiosis) was evaluated in two consecutive years in the field under seven infestation levels: 0, 2, 4, 6, 8, 10 and 20 adult couples per cage with plants.RESULTS: Higher densities of adults increased the number of leaf-feeding scars and larvae on roots, respectively, at the rate ≤2.14 and 2.75 in Pamp and 2.23 and 2.48 in Atal, with the total number of larvae generated being lower in Atal. Grain yield was negatively impacted with increasing larval density on the roots, mainly by decreasing root volume and the number of grains per panicle. Root injury intensity and yield loss showed a nonlinear relationship. It was found that significant yield losses occurred with 8.37 larvae per plant in Pamp and 9.80 larvae per plant in Atal CONCLUSION: The results provided the first evidence of a tolerance limit for RWW larval damage that, even though similar between cultivars of contrasting resistance, corresponds to twice the current conventional level for larval control in Brazil.We also discuss here the potential of applying tolerance limits to manage the RWW adult population in rice fields.

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“…At each rice cropping season, a large quantity of chemical insecticides is applied to seeds for O. oryzae management, mainly those of the pyrazole group (e.g., fipronil), increasing production costs and environmental contamination risks (Martins et al 2017). The use of cultivars resistant to rice water weevil is indicated to reduce potential negative impacts from the chemical control (Stout et al 2009, Martins & Cunha 2015.…”

Section: Palavras-chavementioning

confidence: 99%

Development of Oryzophagus oryzae (Costa Lima) in rice cultivars

Lima

Grützmacher

Pazini

et al. 2019

Pesqui. Agropecu. Trop.

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Insect-resistant cultivars are essential for improving the management of pests such as Oryzophagus oryzae (Coleoptera: Curculionidae), which significantly decreases flooded rice yields. However, the degree of benefit brought to the crop varies with the type of resistance. This study aimed to evaluate the resistance of rice cultivars to O. oryzae, inferring about antixenosis and antibiosis effects on the development of larvae and adults. Under natural infestation conditions, a biennial experiment was carried out using a latin square design, with six treatments (cultivars) and plots with 30 plants (five rows of six plants equidistant 20 cm) irrigated with water depth of 15 cm. The number and weight of larvae by size, as well as the number, weight, emergence rate, and sex ratio of adults, were evaluated using standard soil, plant and root samples. Except for adult sexual ratio, the cultivars differed (p ≤ 0.05) for the other variables, whose relationship evidenced antibiosis effects at the larval stage, making possible to conclude that: the BRS Firmeza cultivar has resistance to O. oryzae due to antixenosis and/or antibiosis effects; BRS Ligeirinho is susceptible to this insect species, resulting in a relatively higher number of well-developed larvae and adults; and IRGA 417 shows an antibiosis action, restricting the adult emergence rates. The weight of adults gives a greater accuracy to the evaluation of the harmful effects of rice cultivars on the O. oryzae development.

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Fipronil residual content in the soil for the control of Oryzophagus oryzae in subsequent flooded rice crops

Cited by 9 publications

References 12 publications

Physiological and enzymatic monitoring of treated seeds of cultivars soybean during storage

Physiological and enzymatic monitoring of treated seeds of cultivars soybean during storage

Differential response to the South American rice water weevil (Coleoptera: Curculionidae) damage of rice cultivars with contrasting levels of resistance: implications for field management

Development of Oryzophagus oryzae (Costa Lima) in rice cultivars

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