Development of Oryzophagus oryzae (Costa Lima) in rice cultivars

Authors

  • Crislaine Barcellos de Lima Federal University of Pelotas image/svg+xml
  • Fernando Felisberto da Silva Federal University of Pampa image/svg+xml
  • Anderson Dionei Grützmacher Federal University of Pelotas image/svg+xml
  • Juliano de Bastos Pazini Federal University of Pelotas image/svg+xml
  • Ana Paula Schneid Afonso da Rosa Embrapa Clima Temperado
  • José Francisco da Silva Martins Centro de Pesquisa Agropecuária de Clima Temperado (Embrapa Clima Temperado) - Embrapa. Pelotas, RS

Abstract

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.

KEYWORDS: Oryza sativa, rice water weevil, integrated pest management.

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Author Biography

  • José Francisco da Silva Martins, Centro de Pesquisa Agropecuária de Clima Temperado (Embrapa Clima Temperado) - Embrapa. Pelotas, RS

    Pesquisador, doutor em Ciências Biológicas, com concentração em Entomologia com especialização em Resistência de Plantas a Insetos. Dedica-se a atividades de pesquisa focadas em Manejo Integrado de Insetos-praga, com ênfase a pré-melhoramento genético de arroz (identificação de linhagens resistentes a insetos) e racionalização do uso de agrotóxicos em agroecossistemas de terras baixas de clima temperado (rotação arroz irrigado: soja).

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Published

2019-06-25

Issue

Vol. 49 (2019)

Section

Research Article

License

Authors will not be paid for published articles and must waive their copyright in favor of the PAT journal. On the other hand, they are solely responsible for the content of those articles, even if the Editor holds the right to adjust them to the norms of the journal. Authors are allowed to publish their articles simultaneously in their institutional repositories, as soon as the original publication at the PAT journal is mentioned.

How to Cite

BARCELLOS DE LIMA, C. et al. Development of Oryzophagus oryzae (Costa Lima) in rice cultivars. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], v. 49, p. e53397, 25 Jun.2019.