Fungicide spray coverage and deposition in soybean asian rust management


  • Giselle Feliciani Barbosa Universidade Estadual de Mato Grosso do Sul
  • Maria Aparecida Pessôa da Cruz Centurion Universidade Estadual Paulista
  • Marcelo da Costa Ferreira Universidade Estadual Paulista
  • Pedro Luís da Costa Aguiar Alves Universidade Estadual Paulista



Chemical control, Sowing season, Leaf area index, Phakopsora pachyrhizi Sydow and P. Sydow, Plant population


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.


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How to Cite

BARBOSA, G.F., CENTURION, M.A.P. da C., FERREIRA, M. da C. and ALVES, P.L. da C.A., 2019. Fungicide spray coverage and deposition in soybean asian rust management. Bioscience Journal [online], vol. 35, no. 5, pp. 1422–1431. [Accessed22 April 2024]. DOI 10.14393/BJ-v35n5a2019-42323. Available from:



Agricultural Sciences