Effect of foliar application of potassium silicate on the progress of coffee leaf rust

Abstract

In order to evaluate the effect of potassium silicate spray on the control of coffee leaf rust and coffee yield, an experiment was conducted during the 2005/2006 and 2006/2007 growing seasons on Coffea arabica cv. Catuaí Vermelho IAC 144, in a location situated at an elevation of 850 m in Coimbra, Minas Gerais, Brazil. The treatments consisted of: 1 -potassium silicate; 2 -potassium silicate + copper hydroxide; 3 -copper hydroxide; 4 -epoxiconazole formulated with pyraclostrobin and 5 -control treatment. Six applications of potassium silicate and copper hydroxide were made twice per month from December to March of each year. Two applications of the systemic fungicide were done in December and March of each year. Potassium silicate alone or in combination with copper hydroxide was not efficient in reducing coffee leaf rust incidence and increasing yield under high incidence of coffee leaf rust.

Organomineral fertilizer as an alternative for increasing potato yield and quality

“…A reduction in leaf dry matter was also found by Fernandes et al (2010), with a dry matter percentage between 14% and 16% for Agata cultivars. Generally, K can cause a reduction in leaf dry matter, as observed by Lopes et al (2013). In our study, there was a K input of 947.7 (25%), 1,895.4 (50%), 2,843.1 (75%), and 3,790.8 kg ha -1 (100%) from organomineral fertilizer using the formulation 2-8-5, which corresponded to a K (K 2 O) concentration of 5%.…”

The coffee leaf rust pathogen Hemileia vastatrix: one and a half centuries around the tropics

“…The reduction in the availability of effective approved fungicides because of health and environmental concerns has made it necessary to intensify research for the development of novel, effective and sustainable disease control solutions. The effects of potassium silicate and essential oils have been tested recently, but with limited success (Lopes et al ., and Pereira et al ., , respectively). However, promising results have been obtained with a resistance inducer of the benzothiadiazole (BTH) group, such as acibenzolar‐ S ‐methyl (Fernandes et al ., ; Guzzo et al ., ; Marchi et al ., ).…”

Current status and management of coffee leaf rust in Brazil

“…Several researchers have investigated alternative control methods such as biological control, use of plant extracts, mineral nutrition, silicates and induced host resistance (Costa et al 2007;Santos 2007;Tratch and Bettiol 1997;Pereira 2008;Haddad et al 2009;Carré-Missio et al 2009;Carvalho et al 2012;Carré-Missio et al 2012;Lopes et al 2013). In general, mineral nutrition and plant extracts show limited effects on coffee leaf rust (Santos 2007;Pereira 2008), contrary to biocontrol using Bacillus thuringiensis and B. subtilis that exhibited some effect (Bettiol et al 1994;Cristancho 1995;Haddad et al 2009).…”

“…Several species of Lecanicillium besides Lecanicillium lecani may be involved in such parasitism and deserve investigation. As to the use of calcium and potassium silicates, results showed that application was not efficient either as foliar spray or to the soil (Carré-Missio et al 2009Lopes et al 2013). On the other hand, treatment with Viçosa mixture and Bordeaux mixture have reduced rust incidence by 75 % due to the effect of copper sulfate (Souza et al 2011;Carvalho et al 2012).…”