ORIGINAL ARTICLE
Air-assistance and low volume application to control of Asian rust on soybean crop
 
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São Paulo State University “Julio de Mesquita Filho”, Vegetal Production Department, P.O Box 237, Postal Code 18610-307, Botucatu, São Paulo, Brazil
CORRESPONDING AUTHOR
Christovam Rafael de Souza
São Paulo State University “Julio de Mesquita Filho”, Vegetal Production Department, P.O Box 237, Postal Code 18610-307, Botucatu, São Paulo, Brazil
 
Journal of Plant Protection Research 2010;50(3):354–359
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ABSTRACT
Currently, one of factors that cause the production cost increase of soybean crop is the pesticide application. The most important disease in soybean crop is Asian rust, caused by Phakopsora pachyrhizi Sydon & P. Sydon fungus, which can cause significant loss of the production. Therefore, this work aimed at evaluation of different spraying techniques on the spray deposits and some parameters of soybean crop: grain size, weight of 1 000 seeds and the crop productivity. Two experiments were carried out in the experimental area of FCA/UNESP (Faculdade de Ciencias Agronomicas/Universidade Estadual Paulista ”Julio de Mesquita Filho“) – Botucatu, SP, Brazil, in soybean crop, Conquista variety, in the 2007/2008 season. In the first experiment, three air levels (0, 9 and 29 km/h of the air speed generated by fan) with flat fan nozzle XR 8002 with a spray volume of 130 l/ha were compared with a rotating nozzle – using low volume oily – LVO at 40 l/ha of spray volume. The second experiment was carried out under the same conditions as the previous experiment, including a control treatment (untreated plants). The disease severity was evaluated using a diagrammatic scale with a visual evaluation of the disease on 15 leaves of each plot. The grades varied between 0.6 and 78.5% of the disease severity. The use of air assistance when compared with the rotating system nozzle did not show significant differences for spray deposits on adaxial and abaxial surface of the leaves in bottom part of the plant. The air assistance with maximum air speed (29 km/h) increased the productivity with respect of the other treatments.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
 
REFERENCES (8)
1.
Andrei E. 2005. Compêndio de Defensivos Agrícolas. 7th ed. Andrei Editora Ltda, São Paulo, 1141 pp.
 
2.
Antuniassi U.R. 2006. Tecnologia de aplicação de defensivos na cultura da soja. 193–219. In: “Boletim Técnico de Pesquisa Soja 2006” (S. Suzuki, M.M. Yuyama, S.A. Camacho, eds.). Fundação Mato Grosso, Rondonópolis.
 
3.
Chaim A., Valarini P.J., Oliveira D.A., Morsoleto R.V., Pio L.C. 1999. Avaliação de Perdas de Pulverização em Cultura de Feijão e Tomate. Embrapa Meio Ambiente, Jaguariúna, (Boletim de Pesquisa). 29 pp.
 
4.
Godoy C.V., Hoga L.J., Canteri M.G. 2006. Diagrammatic scale for assessment of soybean rust severity. Fitopatologia Brasileira 31 (1): 63–68.
 
5.
Monteiro M.V.M. 2006. BVO Terrestre. Manual de Operação Para Aplicações Terrestres em BVO. Centro Brasileiro de Bioaeronautica, Sorocaba, 9 pp.
 
6.
Ozkan E. 2005. Best spraying strategies to fight against Soybean Rust. Disposable in: http://www.jacto.com/soybean_r....
 
7.
Yorinori J.T., Júnior J.N., Lazzarotto J.J. 2004. Ferrugem “Asiática” da Soja no Brasil: Evolução, Importância Econômica e Controle. EMBRAPA soja, Londrina. (Documentos, 247), 36 pp.
 
8.
Yorinori J.T. 2005. A ferrugem asiática da soja no continente americano: evolução, importância econômica e estratégias de controle. p. 21–37. In: Workshop Brasileiro sobre a Ferrugem Asiática. Agosto 2005, Uberlândia, Coletânea, EDUFU, Uberlândia.
 
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