Abstract
Abstract Rose is a plant of high nutritional requirement, susceptible to powdery mildew disease caused by fungus Oidium leucoconium, which causes leaf fall and losses in flower production. The objective of this study was to evaluate powdery mildew severity in rose cultivar ‘Grand Gala’ in response to organic fertilization and the application of alternative products to disease control. The first experiment was set in a factorial arrangement, with 5 alternative products: spraying with water as a control (PA), lime sulfur (CS), neem oil (ON), mixture of sodium bicarbonate and canola oil (BC) and coffee pyroligneous acid (APC) and 2 organic fertilizers: chicken manure (EA) and biofertilizer based on banana stalk (B). Disease severity was assessed at 0, 15, 30 and 45 days after the treatments. In the second experiment, asymptomatic leaves or with different powdery mildew severity levels were sprayed only once with the same alternative products mentioned above. Severity was assessed at 0, 7 and 14 days. The organic fertilizations did not influence the reduction in powdery mildew severity in rose. At 45 days, APC yielded a greater reduction in disease severity (81.6%), followed by treatments based on BC, ON and CS. Greater reduction in disease severity in experiment 2 occurred in the treatments of BC and CS, followed by APC. Therefore, it is possible to conclude that APC and the BC have the potential to control rose powdery mildew in an organic cultivation system.
Highlights
Rose (Rosa spp.) is one of the main ornamental plants and its economic and cultural potential has been explored for many years through its use in floriculture and landscaping, in the constitution of cosmetics and medicines, besides gastronomy (Domínguez-Serrano et al, 2016; Prata et al, 2017)
Due to the scarcity of information in these areas in the literature and the existing demand among producers, this study aimed to evaluate the severity of powdery mildew in ‘Grand Gala’ rose in response to the use of organic fertilization and alternative products
There were no significant differences among treatments of sprayed fungicide products in disease severity but, in the other evaluation periods, there was a statistical difference among treatments (Table 3)
Summary
Rose (Rosa spp.) is one of the main ornamental plants and its economic and cultural potential has been explored for many years through its use in floriculture and landscaping, in the constitution of cosmetics and medicines, besides gastronomy (Domínguez-Serrano et al, 2016; Prata et al, 2017). Rose is the main cut flower produced in the world. It is a species of high nutritional demand, susceptible to various diseases such as mildew (Peronospora sparsa Berk.), gray mold Temperature, air circulation in the environment, and relative humidity of air are the climatic conditions that most influence the spread and severity of this pathogen (Alexandre et al, 2016). Powdery mildew shows a close relationship with environmental conditions at any time of the year, but the complete pathogen cycle occurs under temperature conditions around 21° C and high relative humidity (Domínguez-Serrano et al, 2016)
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