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

Autor: Pazini JB; Department of Plant Protection, Federal University of Pelotas, Pelotas, Brazil., Grützmacher AD; Department of Plant Protection, Federal University of Pelotas, Pelotas, Brazil., Seidel EJ; Department of Statistics, Federal University of Santa Maria, Santa Maria, Brazil., Vieira AMC; Department of Statistics, Federal University of São Carlos, São Carlos, Brazil., Padilha AC; Department of Entomology and Acarology, University of São Paulo, Piracicaba, Brazil., de Brito GG; Embrapa Temperate Agriculture, Brazilian Agricultural Research Corporation, Pelotas, Brazil., Bernardi D; Department of Plant Protection, Federal University of Pelotas, Pelotas, Brazil., Barrigossi JAF; Brazilian Agricultural Research Corporation, Embrapa Rice & Beans, Santo Antônio de Goiás, Brazil., Martins JFDS; Embrapa Temperate Agriculture, Brazilian Agricultural Research Corporation, Pelotas, Brazil.
Jazyk: angličtina
Zdroj: Pest management science [Pest Manag Sci] 2023 Mar; Vol. 79 (3), pp. 947-958. Date of Electronic Publication: 2022 Nov 15.
DOI: 10.1002/ps.7262
Abstrakt: 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. © 2022 Society of Chemical Industry.
(© 2022 Society of Chemical Industry.)
Databáze: MEDLINE
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