Efeito de fungicidas do grupo químico das estrobilurinas no controle da Mancha Preta dos Citros, na produção e na qualidade tecnológica dos frutos
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Data
2011-12-05
Autores
Ikeda, Mário [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste trabalho foi avaliar a resposta do número de aplicações do fungicida pyraclostrobin no controle da Mancha Preta dos Citros (Guignardia citricarpa), assim como comparar o comportamento das diferentes estrobilurinas recomendadas no controle da doença. Também foi avaliada a influência dos tratamentos fungicidas sobre a produção e qualidade tecnológica dos frutos. Para tal foram realizados dois experimentos, em pomares de laranjeira „Valência‟ com histórico comprovado da ocorrência da doença em anos anteriores e com elevada intensidade e frequência na distribuição dos sintomas entre as plantas. Foram avaliados seis tratamentos, com três a quatro aplicações de fungicidas sistêmicos, isolado ou em mistura com cobre. Os tratamentos citados foram precedidos por duas aplicações de fungicida cúprico (CO), iniciando-se na fase de 2/3 de pétalas caídas e repetidas depois de quatro semanas. As aplicações de produtos sistêmicos (três ou quatro) foram realizadas quatro semanas após a segunda aplicação de fungicida cúprico, com intervalo de seis semanas entre elas. As estrobilurinas avaliadas foram pyraclostrobin (PY), azoxystrobin (AZ) e trifloxystrobin (TR) isolado ou em combinação com fungicida cúprico. Todos os tratamentos aplicados receberam um tratamento adicional com carbendazim (CA) como fechamento das pulverizações. Dessa forma, os tratamentos e as respectivas sequências foram:...
The objective of this study was to evaluate the number of applications of the fungicide pyraclostrobin for control of Citrus Black Spot (Guignardia citricarpa) and compare the action of the different recommended strobilurins for disease control. We also analyzed the influence of fungicide treatments on the production and technological quality of fruit. For this purpose two experiments were conducted in orchards of „Valencia‟ sweet orange with proven track records of disease occurrence in previous years and with high intensity and frequency distribution of symptoms among the plants. We evaluated six treatments, with three or four applications of systemic fungicides, alone or mixed with copper. The cited treatments were preceded by two applications of copper fungicide (CO), beginning on the phase 2/3 of petals fallen and repeated after four weeks. The applications of systemic products (three or four) were performed four weeks after the second application of cooper fungicide, with an interval of six weeks between them. The strobilurins tested were pyraclostrobin (PY), azoxystrobin (AZ) and trifloxystrobin (TR) alone or in combination with cooper fungicide. All treatments received an additional treatment with carbendazim (CA) as the closure of sprays. Thus, treatments and their sequences were:... (Complete abstract click electronic access below)
The objective of this study was to evaluate the number of applications of the fungicide pyraclostrobin for control of Citrus Black Spot (Guignardia citricarpa) and compare the action of the different recommended strobilurins for disease control. We also analyzed the influence of fungicide treatments on the production and technological quality of fruit. For this purpose two experiments were conducted in orchards of „Valencia‟ sweet orange with proven track records of disease occurrence in previous years and with high intensity and frequency distribution of symptoms among the plants. We evaluated six treatments, with three or four applications of systemic fungicides, alone or mixed with copper. The cited treatments were preceded by two applications of copper fungicide (CO), beginning on the phase 2/3 of petals fallen and repeated after four weeks. The applications of systemic products (three or four) were performed four weeks after the second application of cooper fungicide, with an interval of six weeks between them. The strobilurins tested were pyraclostrobin (PY), azoxystrobin (AZ) and trifloxystrobin (TR) alone or in combination with cooper fungicide. All treatments received an additional treatment with carbendazim (CA) as the closure of sprays. Thus, treatments and their sequences were:... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Laranja - Doenças e pragas, Fungicidas, Citrus black spot, Citrus - Fungicides
Como citar
IKEDA, Mário. Efeito de fungicidas do grupo químico das estrobilurinas no controle da Mancha Preta dos Citros, na produção e na qualidade tecnológica dos frutos. 2011. vii, 35 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2011.