Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field

The influence of an early blight epidemic on potato tuber yield was evaluated in three field experiments during 2000 to 2002 crop seasons under Viçosa, Minas Gerais state growing conditions. Through a disease severity gradient method, used four different dosages of fungicide chloratalonil were obtai...

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Main Authors:	Campo Arana, Rodrigo OrlandoZambolim, Laércio, Costa, Luiz Claudio
Format:	article
Language:	Español
Published:	Universidad Nacional de Colombia 2019
Subjects:	Plagas de las plantas - H10 Raíces y tubérculos
Online Access:	http://hdl.handle.net/20.500.12324/34763

id	RepoAGROSAVIA34763
record_format	dspace
spelling	RepoAGROSAVIA347632022-04-07T17:58:18Z Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field Campo Arana, Rodrigo OrlandoZambolim, Laércio Costa, Luiz Claudio Plagas de las plantas - H10 Raíces y tubérculos The influence of an early blight epidemic on potato tuber yield was evaluated in three field experiments during 2000 to 2002 crop seasons under Viçosa, Minas Gerais state growing conditions. Through a disease severity gradient method, used four different dosages of fungicide chloratalonil were obtained four epidemic levels with severity range of D1 (maximum), plot without fungicide treatment, to D4 (minimum), plot with fully dosage fungicide commercial recommended, were obtained, which allowed for comparison of the epidemic effect on plant growth and tuber yield, and indicated the time for initiating of the first early blight (Alternaria solani) lesions on potato foliage The disease was predicted by using the methods based either degree days (DD) with base temperature of 7oC and physiological days (PD) having minimum, optimum and maximum temperature of 7, 21 and 30oC, respectively, accumulated during the period between planting and the first symptom appearance. Plots with higher disease levels along the gradient had significantly loss tuber yield in all trials. The highest yield reduction of 49,6; 52,7 and 58,2% occurred in D1, plots without fungicide treatment, during the years 2000, 2001 and 2002, respectively. The epidemic prediction through accumulated DD or PD did not indicate the appropriate time to initiate the epidemic control. However, the PD method that predicted the first symptoms between 240 and 333 accumulated PDs was found to be more adequate. The data revealed that green leaf area and tuber yield reduction caused by the early blight is dependent upon the disease severity. Compared to the others, the PD method appears to be most suitable to determine when the disease will establish, and thus can be recommended to initiate the disease management at 250 accumulated PDs, under disease-favorable climatic conditions. Papa-Solanum tuberosum 2019-04-29T21:50:52Z 2019-04-29T21:50:52Z 2007 article Artículo científico http://purl.org/coar/resource_type/c_2df8fbb1 info:eu-repo/semantics/article https://purl.org/redcol/resource_type/ART http://purl.org/coar/version/c_970fb48d4fbd8a85 http://hdl.handle.net/20.500.12324/34763 55056 reponame:Biblioteca Digital Agropecuaria de Colombia repourl:https://repository.agrosavia.co instname:Corporación colombiana de investigación agropecuaria AGROSAVIA spa Revista de la Facultad Nacional de Agronomía 60 2 3877 3890 Attribution-NonCommercial-ShareAlike 4.0 International http://creativecommons.org/licenses/by-nc-sa/4.0/ Acceso a texto completo info:eu-repo/semantics/openAccess application/pdf application/pdf Universidad Nacional de Colombia Medellin (Colombia) Revista de la Facultad Nacional de Agronomía; Vol. 60 Núm. 2 (2007): Revista de la Facultad Nacional de Agronomía; p. 3877-3890
institution	Corporación Colombiana de Investigación Agropecuaria
collection	Repositorio AGROSAVIA
language	Español
topic	Plagas de las plantas - H10 Raíces y tubérculos
spellingShingle	Plagas de las plantas - H10 Raíces y tubérculos Campo Arana, Rodrigo OrlandoZambolim, Laércio Costa, Luiz Claudio Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field
description	The influence of an early blight epidemic on potato tuber yield was evaluated in three field experiments during 2000 to 2002 crop seasons under Viçosa, Minas Gerais state growing conditions. Through a disease severity gradient method, used four different dosages of fungicide chloratalonil were obtained four epidemic levels with severity range of D1 (maximum), plot without fungicide treatment, to D4 (minimum), plot with fully dosage fungicide commercial recommended, were obtained, which allowed for comparison of the epidemic effect on plant growth and tuber yield, and indicated the time for initiating of the first early blight (Alternaria solani) lesions on potato foliage The disease was predicted by using the methods based either degree days (DD) with base temperature of 7oC and physiological days (PD) having minimum, optimum and maximum temperature of 7, 21 and 30oC, respectively, accumulated during the period between planting and the first symptom appearance. Plots with higher disease levels along the gradient had significantly loss tuber yield in all trials. The highest yield reduction of 49,6; 52,7 and 58,2% occurred in D1, plots without fungicide treatment, during the years 2000, 2001 and 2002, respectively. The epidemic prediction through accumulated DD or PD did not indicate the appropriate time to initiate the epidemic control. However, the PD method that predicted the first symptoms between 240 and 333 accumulated PDs was found to be more adequate. The data revealed that green leaf area and tuber yield reduction caused by the early blight is dependent upon the disease severity. Compared to the others, the PD method appears to be most suitable to determine when the disease will establish, and thus can be recommended to initiate the disease management at 250 accumulated PDs, under disease-favorable climatic conditions.
format	article
author	Campo Arana, Rodrigo OrlandoZambolim, Laércio Costa, Luiz Claudio
author_facet	Campo Arana, Rodrigo OrlandoZambolim, Laércio Costa, Luiz Claudio
author_sort	Campo Arana, Rodrigo OrlandoZambolim, Laércio
title	Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field
title_short	Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field
title_full	Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field
title_fullStr	Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field
title_full_unstemmed	Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field
title_sort	potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field
publisher	Universidad Nacional de Colombia
publishDate	2019
url	http://hdl.handle.net/20.500.12324/34763
work_keys_str_mv	AT campoaranarodrigoorlandozambolimlaercio potatoearlyblightepidemicsandcomparisonofmethodstodetermineitsinitialsymptomsinapotatofield AT costaluizclaudio potatoearlyblightepidemicsandcomparisonofmethodstodetermineitsinitialsymptomsinapotatofield
_version_	1808105504256294912

Potato early blight epidemics and comparison of methods to determine its initial symptoms in a potato field

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