Effect of Bayfolan® copper on the control of Pseudomonas syringae pv. garcae in vitro

Abstract

One of the limiting factors in coffee production is the aureolated spot caused by the bacterium Pseudomonas syringae pv. garcae. This work aimed to evaluate different Bayfolan® copper concentrations in the growth of two isolates of P. syringae pv. garcae in vitro. P. syringae pv. garcae 157 and 59 isolates were used. Two experiments were carried out in a completely randomized design (CRD) with 7 treatments and 5 replications, in a total of 35 experimental units. Each experimental unit consisted of a Petri dish. For the installation of the experiment, Bayfolan® copper was added and homogenized into Kado 523 culture medium at concentrations of 0; 625; 1.250; 1.875; 2.500 and 3.000 ppm, and as positive control the product Kasumin® was used at 3.000 ppm concentration. Bayfolan® copper reduced the growth of the two isolates evaluated in vitro with increasing concentration. At concentrations of 2.500 and 3.000 ppm, Bayfolan® copper inhibited completely the growth of both isolates, similarly to the Kasumin® treatment. The research reveals that Bayfolan® copper is efficient to control P. syringae pv. garcae in vitro from concentrations of 2.500 ppm onwards.

Keywords

• Bacteriosis. Copper sulphate. Coffea arabica.