Data/hora: 07/06/2024 04:32:27

Biblioteca(s): 	Embrapa Arroz e Feijão; Embrapa Clima Temperado.	
Data corrente: 	13/02/2023	
Data da última atualização: 	14/02/2023	
Autoria: 	PAZINI, J. DE B.; GRÜTZMACHER, A. D.; SEIDEL, E. J.; VIEIRA, A. M. C.; PADILHA, A. C.; BRITO, G. G. de; BERNARDI, D.; BARRIGOSSI, J. A. F.; MARTINS, J. F. da S.	
Afiliação: 	JULIANO DE B. PAZINI, UNIVERSIDADE FEDERAL DE PELOTAS; ANDERSON D. GRÜTZMACHER, UNIVERSIDADE FEDERAL DE PELOTAS; ENIO J. SEIDEL, UNIVERSIDADE FEDERAL DE SANTA MARIA; AFRÂNIO M. C. VIEIRA, UNIVERSIDADE FEDERAL DE SÃO CARLOS; ALINE C. PADILHA, UNIVERSIDADE DE SÃO PAULO; GIOVANI GREIGH DE BRITO, CPACT; DANIEL BERNARDI, UNIVERSIDADE FEDERAL DE PELOTAS; JOSE ALEXANDRE F BARRIGOSSI, CNPAF; JOSE FRANCISCO DA SILVA MARTINS, CPACT.	
Título: 	Differential response to the South American rice water weevil (Coleoptera: Curculionidae) damage of rice cultivars with contrasting levels of resistance: implications for field management.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Pest Management Science, v. 79, n. 3, p. 947-958, Mar. 2023.	
ISSN: 	1526-4998	
DOI: 	https://doi.org/10.1002/ps.7262	
Idioma: 	Inglês	
Conteúdo: 	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 <-8804;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.	
Palavras-Chave: 	Control level; Damage boundary; Damage curve; Tolerance limit.	
Thesagro: 	Arroz; Arroz Inundado; Oryza Sativa; Oryzophagus Oryzae; Praga; Praga de Planta.	
Thesaurus Nal: 	Integrated pest management.	
Categoria do assunto: 	--
O Insetos e Entomologia	
Registro original: 	Embrapa Clima Temperado (CPACT)	
Exemplares: 	CNPAF - (36703-1) - UPC - AP - DD - 2023 -  - 2023 - DIS
CPACT - (22537-1) - UPC - AP - DD -  -  -  - DIS