Curvas de progresso de doenças foliares do milho, sob diferentes tratamentos fungicidas
Carregando...
Arquivos
Data
2007-03-05
Autores
Costa, Frank Magno da [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Representando cerca de 35,6% da safra de grãos do país, a cultura do milho tem sua produtividade ameaçada por um grande número de enfermidades. Diante do exposto o presente trabalho teve por objetivo analisar o progresso da Physopella zeae, Cercospora zeae-maydis e Phaeosphaeria maydis, sob diferentes tratamentos fungicidas na cultura do milho. Conduzido no delineamento de blocos casualizados com 6 tratamentos e 4 repetições em área do Departamento de Fitossanidade da FCAV-UNESP, utilizou-se os seguintes tratamentos de 1-6 (mL de p.c./ha), respectivamente: 1-testemunha; 2-epoxiconazole + pyraclostrobin 500; 3- epoxiconazole + pyraclostrobin 750; 4-azoxystrobin + cyproconazole 300 + óleo mineral parafínico 0,5%; 5-azoxystrobin + cyproconazole 300 + óleo mineral parafínico 0,5% e 6- azoxystrobin + cyproconazole 450 + óleo mineral parafínico 0,5%, todos aplicados com a planta no estádio V8, sendo que o Tratamento 5 foi repetido com a planta no início do pendoamento. Realizou-se 7 avaliações de severidade da doença com intervalos semanais. As curvas de progresso da doença foram analisadas através de 3 transformações (monomolecular, logístico e de Gompertz). Calculou-se a Área Abaixo da Curva de Progresso da Doença (AACPD) para cada doença, estas foram submetidas à análise de variância e as médias comparadas pelo teste de Tukey ao nível de 5% de probabilidade. Observou-se que o modelo monomolecular foi o que melhor se ajustou aos dados para a P. zeae e para a C. zeae-maydis. Em se tratando de P. maydis o modelo logístico proporcionou melhor ajuste...
The corn represents about 35,6% grain crop in Brazil and its productivity is threatened by a great number of pests and diseases. The objective of this study was to analyze the progress of the Physopella zeae, Cercospora zeae-maydis and Phaeosphaeria maydis, under different fungicides treatments in the corn crop. This work was carried out in experimental area of the Departamento de Fitossanidade of UNESP, Campus of Jaboticabal, São Paulo State, Brasil, in the period of January to May of 2006. Was evaluated in field plots arranged in complete randomized blocks, with 6 treatments and 4 replications. The used treatments were (mL of p.c. /ha): 1-check; 2-epoxiconazole + pyraclostrobin 500; 3-epoxiconazole + pyraclostrobin 750; 4-azoxystrobin + cyproconazole 300 + mineral oil 0,5%; 5-azoxystrobin + cyproconazole 300 + mineral oil 0,5% and 6 - azoxystrobin + cyproconazole 450 + mineral oil 0,5%. All the treatments fungicide spray was applied to maize at the stage V8, and the treatment 5 was replicated in the beginning of the tasseling. It was carried out 10 evaluations of the disease severity with a week interval among them. It was analyzed the curves of progress of the diseases through 3 transformations (monomolecular, logistic and Gompertz). There was calculated Area Under Progress Curve Disease (AUDPC), whose the variance analysis and the averages were compared by the Tukey test at 5% probability. It was observed that the monomolecular model had the best adjustment to the data for the P. zeae and C. zeae-maydis. For the P. maydis the logistic model had the best adjustment...(Complete abstract, click electronic address below)
The corn represents about 35,6% grain crop in Brazil and its productivity is threatened by a great number of pests and diseases. The objective of this study was to analyze the progress of the Physopella zeae, Cercospora zeae-maydis and Phaeosphaeria maydis, under different fungicides treatments in the corn crop. This work was carried out in experimental area of the Departamento de Fitossanidade of UNESP, Campus of Jaboticabal, São Paulo State, Brasil, in the period of January to May of 2006. Was evaluated in field plots arranged in complete randomized blocks, with 6 treatments and 4 replications. The used treatments were (mL of p.c. /ha): 1-check; 2-epoxiconazole + pyraclostrobin 500; 3-epoxiconazole + pyraclostrobin 750; 4-azoxystrobin + cyproconazole 300 + mineral oil 0,5%; 5-azoxystrobin + cyproconazole 300 + mineral oil 0,5% and 6 - azoxystrobin + cyproconazole 450 + mineral oil 0,5%. All the treatments fungicide spray was applied to maize at the stage V8, and the treatment 5 was replicated in the beginning of the tasseling. It was carried out 10 evaluations of the disease severity with a week interval among them. It was analyzed the curves of progress of the diseases through 3 transformations (monomolecular, logistic and Gompertz). There was calculated Area Under Progress Curve Disease (AUDPC), whose the variance analysis and the averages were compared by the Tukey test at 5% probability. It was observed that the monomolecular model had the best adjustment to the data for the P. zeae and C. zeae-maydis. For the P. maydis the logistic model had the best adjustment...(Complete abstract, click electronic address below)
Descrição
Palavras-chave
Milho - Doenças e pragas, Epidemiologia, Fungicidas, Controle químico, Physopella zeae, Cercospora zeae-maydis, Phaeosphaeria maydis
Como citar
COSTA, Frank Magno da. Curvas de progresso de doenças foliares do milho, sob diferentes tratamentos fungicidas. 2007. xii, 49 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2007.