Progresso da ferrugem e da cercosporiose do cafeeiro consorciado com grevílea, com ingazeiro e a pleno sol em Lavras - MG

Abstract

, Nelson Venturin 5 RESUMOCom o presente trabalho, objetivou-se avaliar a incidência da ferrugem e da cercosporiose do cafeeiro em diferentes sistemas de cultivo, agroflorestais e a pleno sol, através da curva de progresso dessas doenças. Utilizou-se o delineamento inteiramente casualizado, com três tratamentos e sete repetições. Os tratamentos foram compostos por cafeeiros consorciados com ingazeiro, cafeeiros consorciados com grevílea e cafeeiros cultivados convencionalmente a pleno sol. As avaliações foram realizadas mensalmente no período de abril de 2001 a março de 2003. Realizou-se o cálculo da área abaixo da curva de progresso da doença (AACPD), a qual foi submetida à análise de variância. Para a incidência da ferrugem do cafeeiro o consórcio cafeeiro x ingazeiro mostrou-se com maiores índices da doença, sendo que os tratamentos consórcio cafeeiro x grevílea e cafeeiro a pleno sol não diferiram entre si e apresentaram menores incidências da doença. Diminuição na luz solar direta e maior umidade podem ter favorecido a ferrugem no sistema cafeeiro x ingazeiro. Para a incidência de cercosporiose, os cafeeiros a pleno sol obtiveram maiores valores de incidência da doença, seguidos por cafeeiros x grevílea, e menores taxas da doença foram observadas no consórcio cafeeiros x ingazeiro. A incidência de radiação solar direta pode ter favorecido a maior incidência de cercosporiose nos cafeeiros a pleno sol.Termos para indexação: Doenças do cafeeiro, sistemas agroflorestais. ABSTRACTThe present work aimed to evaluate the incidence of rust and coffee plant cercosporiose in different systems of agroforest cultivation and in the full sunshine through the progress curve of those diseases. The completely randomized design with three treatments and seven replicates was utilized. The treatments were made up of coffee plants mixed with ingazeiro, coffee plants mixed with grevílea and coffee plants cultivated conventionally in the full sunshine. The evaluations were performed monthly during the period of April 2001 to March 2003. The calculation of the area bellow the disease progress curve (ABDPC), which was submitted to the variance analysis. For the incidence of the coffee plant rust, the coffee plant x ingazeiro mixing presented the highest indices of the disease, the treatments coffee plant x grevílea mixing and coffee plant in the full sunshine did no differ from each other and presented the smallest indices of the disease. Decrease in the direct solar light and higher humidity may have supported rust in the coffee plant x ingazeiro system. For the incidence of cercosporiose, the coffee plants in the full sunshine obtained higher values of incidence of the disease followed by coffee plants x grevílea and lowest rates of the disease were found in the coffee plant x ingazeiro mixings. The incidence of direct solar radiation may have supported the highest incidence of cercosporiose on the coffee plants in the full sunshine. INTRODUÇÃOO estudo epidemiológico das interações patógeno, hospedeiro e ambiente é fundamental pa...

Cercosporiose progression in the agroforestry consortium coffee-rubber trees

“…In coffee trees that were positioned 11.0 m from double rows of rubber trees, the AUCLSPC was 20% to 26% lower than in the coffee trees grown under full sun. This is consistent with the results of Salgado et al (2007) for coffee trees intercropped with different tree species. The highest disease incidence in the coffee trees grown under full sun potentially resulted from an increase in the cercosporin toxin.…”

“…Planting trees increases soil organic matter inputs from leaf fall, conserves moisture, increases the water absorption and infiltration capacity and reduces nitrogen losses (BLACK;ONG, 2000;JARAMILLO;CHÁVES, 1999;HAIRIAH et al, 2006). Coffee trees in agroforestry systems reduce the emergence of invasive plants ( ROMERO-ALVARADO et al, 2002), decrease the coffee leaf miner (Leucoptera coffeella) population (GUHARAY et al, 2001;LOPES et al, 2012) and decrease the incidence of cercospora leaf spot (Cercospora coffeicola) (SALGADO et al, 2007).…”

“…According to Salgado et al (2007), the incidence of the brown eye spot from C. coffeicola is greater in coffee trees that are grown in full sun than in coffee trees that are grown in shade. In addition, Cercospora leaf spot is often greatest on the sides of coffee trees that receive the greatest light intensity (CUSTÓDIO et al, 2010).…”

Características fisiológicas e desenvolvimento de cafeeiros sob diferentes níveis de sombreamento

“…The treatment under full sun did not provide good coffee plant protection, obtaining the highest cercosporiosis incidence. These results corroborate those of Salgado et al (2007), in which the authors verified that the cercosporiosis incidence was directly affected by the afforestation of the coffee plantation. The main causes of accentuated cercosporiosis intensity are associated to the water deficit and unbalance or deficiency of some nutrients.…”

“…Thus, the coffee plant under full sun would probably be more susceptible to the cercosporiosis incidence due to lower soil moisture, as a result of the direct exposure to the sun under this system. Higher soil moisture of shaded system increases water and nutrient uptake over time, decreasing the cercosporiosis incidence in coffee plants (Salgado et al, 2007).…”