Incidência da varíola, causada por Asperisporium caricae, em folhas de mamoeiros submetidos ao manejo orgânico, em diferentes ambientes de cultivo

Abstract

Transplants of Baixinho de Santa Amália papaya cultivar were grown in three neighboring plant growth facilities: a) greenhouse (covered with plastic sheet); b) shaded greenhouse (with sombrite 30% black screen over the plastic sheet); c) screenhouse (covered with sombrite 30% only). Next to such structures a plot was settled for cultivation under natural environment. Cultural practices were conducted according to technical regulations for organic production. Irrigations were proceeded with plastic hose avoiding to wet leaves and fruits. From the 45 th day after transplanting and subsequently at monthly intervals the plants were monitored in relation to incidence of leaf lesions caused by the fungus Asperisporium caricae. For Martelleto, L.A.P.; Ribeiro, R.L.D.; Carmo, M.G.F., Sudo-Martelleto, M.; Goes, A. Incidence of asperisporium black spot, caused by Asperisporium caricae, under organic management in different cropping environments. Summa Phytopathologica, v.35, n.4, p.288-292, 2009 Keywords: Carica papaya, organic agriculture Palavras-chave adicionais: Carica papaya, agricultura orgânica. RESUMOMudas de mamoeiro da cultivar Baixinho de Santa Amália foram transplantadas para covas de 40x60x40 cm, em áreas de três estruturas contíguas: (a) estufa sombreada (cobertura de plástico), (b) estufa sombreada + sombrite (cobertura adicional de sombrite com 30% de sombreamento sobre o plástico) e (c) telado (cobertura exclusiva de sombrite 30%). Ao lado de tais estruturas foi implantada uma área de cultivo de mamoeiro em ambiente natural. Os tratos culturais aplicados foram os condizentes às normas técnicas vigentes na agricultura orgânica. As irrigações foram procedidas com mangueira plástica, evitando-se molhar folhas e frutos. Aos 45 dias pós-transplantio e, subseqüentemente, a intervalos mensais, as plantas foram inspecionadas em relação à incidência de lesões foliares causada pelo fungo Martelleto, L.A.P.; Ribeiro, R.L.D.; Carmo, M.G.F., Sudo-Martelleto, M.; Goes, A. Incidência da varíola, causada por Asperisporium caricae, em folhas de mamoeiros submetidos ao manejo orgânico em diferentes ambientes de cultivo. Summa Phytopathologica, v. 35, n.4, p.288-292, 2009 Asperisporium caricae. Para efeito de análise estatística, após o teste de homogeneidade das variâncias, foram consideradas quatro repetições por ambiente (tratamento), com seis plantas úteis por parcela. O modelo de quan tifi caç ão d a doença ind icou efeito alt amen te significativo dos ambientes protegidos, estufa e estufa sombreada, quanto à incidência de sintomas, em comparação com ambientes de telado e em área natural de cultivo. Durante os 12 meses de avaliações foi constatada alta correlação entre incidência da doença e pluviosidade e umid ade rela tiva do ar. As est rutu ras coberta s com plásti co demonstraram alto potencial de controle de A. caricae, sendo, portan to, recomend áveis n o si stem a orgân ico de p rodu ção do mamoeiro. statistical analysis, after homogeneity of variance test, four repetition were considered within ea...

Sensitivity of hyperparasitic fungi to alternative products for use in the control of papaya black spot

“…That is because of the difference in genders, although it may even occur in the same lineage of fungi. The natural genetic variability between isolates of the same species of fungus is well known and widely reported in the literature for several biological parameters, including for sensitivity to synthetic chemical products (Liu et al, 1993;Anhalt et al, 2010).…”

“…However, studies in search of integrated control strategies for papaya black spot are scarce (Santos and Barreto, 2003). According to Martelleto et al (2009), the difficulty in controlling the papaya black spot is most evident in the organic production system due to few research results and to restriction on conventional fungicide use. To contribute to the alternative control for this disease, the application of phosphite, foliar fertilizers, and resistance inductors has been studied (Pratissoli et al, 2007;Oliveira and Nishijima, 2014;Santos et al, 2017).…”

A Newly Emerging Disease of Papaya in Ethiopia: Black Spot (Asperisporium caricae) Disease and Management Options

“…Black spot is one of the fungal diseases that have expressive consequences in terms of photosynthetic area and recurring damages to production and papaya fruit quality [19][20][21][22]. The pathogen affects the leaf and fruit parts which get attention by producers and consumers in reducing the economic value.…”

Genetic parameters and performance of papaya genotypes to black spot resistance (Asperisporium caricae)

“…Maubl. black spot is one of the fungal diseases that has expressive consequences in terms of photosynthetic area and recurring damages to production and papaya fruit quality (Oliveira et al, 2000;Martelleto et al, 2009;Souza et al, 2014). The development of resistant cultivars is a strategic measure to sustain and increase competitiveness of papaya agribusiness, as well as to follow the trend of the conscious market concerning the food security, considering the large exportation of papaya from Brazil to the European and American markets.…”