Progresso temporal da ferrugem e fungicidas para controle das doenças foliares do pessegueiro

Abstract

RESUMO -O objetivo do trabalho foi avaliar o progresso da ferrugem do pessegueiro e a eficiência de fungicidas no controle de da ferrugem e do furo-de-bala em pomares da região metropolitana de Curitiba-PR. Os ensaios foram conduzidos em pomar comercial com o delineamento experimental em blocos ao acaso, Cultivar Chimarrita, com quatro tratamentos (mancozebe, tiofanato metílico, clorotalonil e testemunha, sem pulverização) e quatro repetições, nas safras de 2004/2005 e 2005/2006. Cada fungicida foi pulverizado oito vezes, com intervalo de 15 a 20 dias entre as aplicações. A avaliação do progresso da epidemia de ferrugem e a eficiência dos fungicidas no controle das doenças foram feitas com base na incidência e severidade da doença nas folhas e na porcentagem de desfolha das plantas. A taxa de progresso da doença e o inóculo inicial na testemunha não diferiram significativamente entre os anos. Todos os fungicidas reduziram a desfolha e a severidade da ferrugem, mas o clorotalonil foi melhor e também reduziu a incidência em ambos os anos. Os fungicidas mancozebe e tiofanato metílico reduziram a incidência de furo-de-bala. Termos para indexação: Prunus persica, Tranzschelia discolor, Wilsonomyces carpophilus incidência, controle químico. TEMPORAL PROGRESS OF PEACH RUST AND FUNGICIDES TO CONTROL THE FOLIAR DISEASES OF PEACH TREEABSTRACT -The aim of this study was to evaluate the development of the peach rust in two seasons and, the efficiency of fungicides to control the peach rust and the shot-hole in orchards of the metropolitan region of Curitiba, Paraná, Brazil. The trials were carried out in a commercial orchard and were designed in complete randomized blocks, cv. Chimarrita, with four treatments (mancozeb, thiophanate methyl, chlorothalonil and control-unsprayed) and four replications, in the crop seasons 20004/5 and 2005/06. Each fungicide was sprayed eight times, at 15 to 20 days intervals. The assessment of the epidemic progress and effectiveness of fungicide were performed based on the incidence and severity on leaves and percentage of plants defoliation. The progress rate of the epidemic and the initial inoculum did not differ significantly between years and the logistic model fit to data of both years. All fungicides reduced the defoliation and severity of peach rust, but chlorothalonil was the best and also reduced the incidence in both years. The fungicides mancozeb and thiophanate methyl reduced the shot-hole incidence. Termos para indexação: Prunus persica, Transzchelia discolor, Wilsonomyces carpophilus incidence, chemical control.

Control of spot on pomegranate fruit in field and phytosanitary quality during postharvest

“…In a study of the Thyrostroma carpophilum control, in species from the genus Prunus, Alves et al (2011) found an efficient control of shot hole (T. carpophilum) in peaches when using Mancozeb and methyl thiophanate, similarly to the results found in the present study. However, to date, no study has been published regarding the controlling of pomegranate peel spots caused by T. carpophilum, according to the consulted literature.…”