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

被引:3
|
作者
Spolti, Pierri [1 ]
Valdebenito-Sanhueza, Rosa Maria [2 ]
Gleason, Mark Lawrence [3 ]
Del Ponte, Emerson Medeiros [1 ]
机构
[1] Univ Fed Rio Grande do Sul, Fac Agron, Dept Fitossanidade, BR-91540000 Porto Alegre, RS, Brazil
[2] Proterra Engn Agrom Ltda, BR-95200000 Vacaria, RS, Brazil
[3] Iowa State Univ, Dept Plant Pathol, Ames, IA 50011 USA
关键词
Malus domestica; disease forecasting; fungicide management; integrated pest managemet; GLOEODES-POMIGENA; SCHIZOTHYRIUM-POMI; NORTH-CAROLINA; APPLE; INFECTION; COMPLEX;
D O I
10.1590/S0100-204X2011000700004
中图分类号
S [农业科学];
学科分类号
09 ;
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.
引用
收藏
页码:697 / 705
页数:9
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