Pesquisa Agropecuária Brasileira (2012) 47, 920-927

Mônica Paula Debortoli, Nédio Rodrigo Tormen, Ricardo Silveiro Balardin, Diego Dalla Favera, Marlon Tagliapietra Stefanello, Felipe Frigo Pinto and Juliano Daniel Uebel (2012)
Espectro de gotas de pulverização e controle da ferrugem-asiática-da-soja em cultivares com diferentes arquiteturas de planta
[Spray droplet spectrum and control of Asian soybean rust in cultivars with different plant architecture]
Pesquisa Agropecuária Brasileira 47 (7), 920-927
Abstract: The objective of this work was to determine the ideal spray droplet spectrum for the control of Asian soybean rust (Phakopsora pachyrhizi), in cultivars with different plant architecture. The experiment was carried out in the 2009/2010 crop season. Fungicide application (pyraclostrobin + epoxyconazole, with mineral oil) was evaluated with four spray droplet spectra - very fine, <119 μm; fine, 119 to 216 μm; medium, 217 to 352 μm; and coarse, 353 to 464 μm - in four soybean cultivars (BMX Apollo RR, NA 7636 RR, Fcep 53 RR, and TMG 4001 RR) contrasting as to leaf area index, plant height, and number of branches per plant. The following variables were quantified: number of drops per cm², median volume diameter of droplets, area under the progress curve of soybean rust, and soybean yield. The definition of the droplet spectrum to be used should consider cultivar and environmental conditions in which the pulverization will be done. The protection magnitude exerted by the fungicide varies according to the plant coverage and the penetration of droplets into the canopy provided by the different droplet spectra. The fine droplet spectrum provides good droplet deposition, disease control, and productivity, regardless of the evaluated cultivar.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phakopsora pachyrhizi	Soybean (Glycine max)	Brazil (south)