Sooty blotch and flyspeck control with fungicide applications based on calendar, local IPM, and warning system

Pesquisa Agropecuária Brasileira

Piérri Spolti¹  Rosa Maria Valdebenito-sanhueza²  Mark Lawrence Gleason²  Emerson Medeiros Del Ponte¹ 

[1] ,Universidade Federal do Rio Grande do Sul Faculdade de Agronomia Departamento de FitossanidadePorto Alegre RS ,Brazil

关键词: Malus domestica;    disease forecasting;    fungicide management;    integrated pest managemet;    Malus domestica;    previsão de doença;    manejo de fungicidas;    manejo integrado de doenças;   

DOI  :  10.1590/S0100-204X2011000700004

来源: SciELO

【 摘 要 】

The objective of this work was to compare fungicide application timing for the control of sooty blotch and flyspeck (SBFS) of 'Fuji' apples in Rio Grande do Sul state, Brazil. The following treatments were evaluated in two growing seasons: two warning system-based (modified version of the Brown-Sutton-Hartmann system) spray of captan plus thiophanate methyl, with or without summer pruning; two calendar/rain-based spray of captan or a mixture of captan plus thiophanate methyl; fungicide spray timing based on a local integrated pest management (IPM) for the control of summer diseases; and a check without spraying. Sooty blotch and flyspeck incidence over time and their severity at harvest were evaluated. The highest number of spray was required by calendar/rain-based treatments (eight and seven sprays in the sequential years). The warning system recommended five and three sprays, in the sequential years, which led to the highest SBFS control efficacy expressed by the reduced initial inoculum and disease progress rate. Summer pruning enhanced SBFS control efficacy, especially by suppressing SBFS signs which tended to be restrained to the peduncle region of the fruit. Sooty blotch and flyspeck can be managed both with calendar and the grower-based IPM practices in Brazil, but a reduced number of sprays is required when the warning system is used.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License