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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

FUNGICIDE SPRAY COVERAGE AND DEPOSITION IN SOYBEAN ASIAN RUST MANAGEMENT

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Autor(es):
Barbosa, Giselle Feliciani [1] ; da Cruz Centurion, Maria Aparecida Pessoa [2] ; Ferreira, Marcelo da Costa [2] ; da Costa Aguiar Alves, Pedro Luis [2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] State Univ Mato Grosso do Sul UEMS, Cassilandia, MS - Brazil
[2] State Univ Sao Paulo UNESP, Sao Paulo - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: BIOSCIENCE JOURNAL; v. 35, n. 5, p. 1422-1431, SEP-OCT 2019.
Citações Web of Science: 0
Resumo

At maximum vegetative growth, sprays with fungicide to control Asian rust (Phakopsora pachyrhizi Sydow and P. Sydow) should reach high canopy penetration and plant coverage. Therefore, the central objective of this study was to determine leaf area, spray deposition, and plant coverage by fungicides sprayed on soybeans as a function of sowing seasons and plant population densities with reduced doses of tebuconazole and azoxystrobin + cyproconazole. Field experiments were conducted in the 2009/2010 and 2010/2011 crop years, using a medium-cycle soybean cultivar MG/BR-46 (Conquista) under a natural infestation of Asian soybean rust. Leaf area (LA) and leaf area index (LAI) were measured at three developmental stages (V8, R2, and R4). Spray deposition and coverage were evaluated during the first fungicide spraying. As results, LAI decreased as plant population decreased. Despite the lower LAIs, smaller plant populations had no effect on spray deposition and plant coverage. Both fungicides presented similar depositions on all thirds when plants had lower development. (AU)

Processo FAPESP: 08/54224-9 - Manejo integrado da ferrugem asiática da soja
Beneficiário:Maria Aparecida Pessôa da Cruz Centurion
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 08/54225-5 - Manejo integrado da ferrugema asiática da soja
Beneficiário:Giselle Feliciani Barbosa
Linha de fomento: Bolsas no Brasil - Doutorado