Progresso da ferrugem e da cercosporiose em cafeeiro (Coffea arabica L.) com diferentes épocas de início e parcelamentos da fertirrigação
Data
2003-01
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Editora UFLA
Resumo
Avaliações da incidência da ferrugem (Hemileia vastatrix Berk. & Br.) e da cercosporiose (Cercospora coffeicola Berk. & Cooke) foram realiza- das em experimento com a cultura do café cultivar Ca- tuai , com 12 anos de cultivo. Os objetivos foram avali- ar o efeito da irrigação e da fertirrigação na incidência da ferrugem e da cercosporiose, analisar a curva de pro- gresso dessas doenças e sua correlação com as variáveis climáticas. O delineamento experimental foi o de blocos ao acaso, com 4 tratamentos de diferentes parcelamen- tos de adubação (1: 12 aplicações manuais, 2: 12 aplica- ções via fertirrigação, 3: 24 aplicações fertirrigado, 4: 36 aplicações fertirrigado). As parcelas foram divididas em 3 subparcelas com diferentes épocas de início de ir- rigação (subparcelas A: 1o de junho, B: 15 de julho, C: 1o de setembro) e 2 tratamentos adicionais (testemu- nhas): tratamento adicional 1- fertirrigação parcelada em 4 vezes e não irrigado; tratamento adicional 2- adubação convencional, não irrigado. Observou-se a inci- dência de ambas as doenças em 6 folhas por planta a cada 14 dias durante o período de 21 de março de 1998 a 6 de fevereiro de 1999. Calculou-se a área abaixo da curva de progresso da doença (AACPD), procedendo-se à análise de variância e teste de Tukey a 5%. Para a fer- rugem do cafeeiro, nenhum tratamento foi significativo, e as incidências máximas foram nos meses de julho a setembro. Houve correlação significativa entre todos os tratamentos e as variáveis climáticas, com exceção da temperatura máxima. Para a cercosporiose, observou-se nas parcelas, maior AACPD para os tratamentos 2 e 4. O tratamento adicional 1 apresentou maior AACPD, se- guida pelo tratamento adicional 2 . De acordo com as curvas de progresso da doença, a incidência máxima foi entre maio a setembro. Houve correlação significativa da incidência da cercosporiose com as variáveis climáti- cas na maioria dos tratamentos.
Evaluations of incidence of rust (Hemileia vastatrix Berk. & Br.) and brown eye spot (Cercospora cof eicola Berk. & Cooke) took place at intervals of 14 days, observing 6 leaves per plant during the period from March 21, 1998 to February 6, 1999 in a Catuai culture. The objective was to evaluate the effect of irrigation and fertirrigation on the incidence of rust and in 12 year coffee plants and analyze the progress curve of these diseases and their correlation to climatic variables. The experimental design was the one of randomized blocks with four treatments of different fertilizer splitting (1: 12 hand applications, 2:12 applications via fertirrigation, 3: 24 fertirrigated applications, 4: 36 fertirrigated applications). The plots were divided in 3 subplots that received treatments in different periods at initial irrigation (subplots A: June 1, B: July 15, C: September 1), and 2 checks (additional treats 1: fertilized 4 times and not irrigated, additional treats 2: conventional fertilizer and not irrigated). The area under disease progress curve (AUDPC) was calculated and submitted to variance analysis and Tukey s test at 5% probability. For the coffee rust, no treatment was significant. Curve progress showed maximum incidences in the months of July and September. There was a significant correlation at 1% probability among all the treatments and climatic variables, with the exception of the maximum temperature. For brown eye spot, the treatments attributed to the plots and to the subplots were significant at 1% of probability. However, the interaction between the two was non- significant. Greater AUDPC in splitting fertilizer 2 and 4 was observed. In the subplots, greater AUDPC in check E following for D was observed. Curve progress showed maximum incidences from May to July. There was a significant correlation of brown eye spot incidence in the majority of the treatments in relation to climatic variables.
Evaluations of incidence of rust (Hemileia vastatrix Berk. & Br.) and brown eye spot (Cercospora cof eicola Berk. & Cooke) took place at intervals of 14 days, observing 6 leaves per plant during the period from March 21, 1998 to February 6, 1999 in a Catuai culture. The objective was to evaluate the effect of irrigation and fertirrigation on the incidence of rust and in 12 year coffee plants and analyze the progress curve of these diseases and their correlation to climatic variables. The experimental design was the one of randomized blocks with four treatments of different fertilizer splitting (1: 12 hand applications, 2:12 applications via fertirrigation, 3: 24 fertirrigated applications, 4: 36 fertirrigated applications). The plots were divided in 3 subplots that received treatments in different periods at initial irrigation (subplots A: June 1, B: July 15, C: September 1), and 2 checks (additional treats 1: fertilized 4 times and not irrigated, additional treats 2: conventional fertilizer and not irrigated). The area under disease progress curve (AUDPC) was calculated and submitted to variance analysis and Tukey s test at 5% probability. For the coffee rust, no treatment was significant. Curve progress showed maximum incidences in the months of July and September. There was a significant correlation at 1% probability among all the treatments and climatic variables, with the exception of the maximum temperature. For brown eye spot, the treatments attributed to the plots and to the subplots were significant at 1% of probability. However, the interaction between the two was non- significant. Greater AUDPC in splitting fertilizer 2 and 4 was observed. In the subplots, greater AUDPC in check E following for D was observed. Curve progress showed maximum incidences from May to July. There was a significant correlation of brown eye spot incidence in the majority of the treatments in relation to climatic variables.
Descrição
Palavras-chave
Fertirrigação, Irrigação, Manejo, Epidemiologia, Hemileia vastatrix, Cercospora coffeicola, Coffea arabica
Citação
TALAMINI, V. et al. Progresso da ferrugem e da cercosporiose em cafeeiro (Coffea arabica L.) com diferentes épocas de início e parcelamentos da fertirrigação. Ciência e Agrotecnologia, Lavras, v. 27, n. 1, p. 141-149, jan./fev. 2003.