Abstract

FERNANDEZ CHAVEZ, Celia Maria. Effect of iprodione, folpet and folpet + prochloraz on the mycelial growth of Alternaria solani and Trichoderma harzianum. CienciAgro [online]. 2018, vol.8, n.1, pp. 32-41. ISSN 2072-1404.

ABSTRACT Tomato is one of the most consumed vegetables worldwide, so it is very important to prevent fungal diseases. Early bli-ght, caused by Alternaria solani causes a considerable decrease in production. The control of this pathogen is with agroche-micals, which give favorable results; however, its use results in harmful effects on the environment due to its residuality. Many fungi compete as antagonists or parasites for the control of phytopathogens. Trichoderma harzianum is produced as a biological fungicide, being the active ingredient of the Trichodex 25% WP product, its mode of action is to consume the nutrients available and secreted by the tissues of the plant. It exerts a competition action for nutrients and space. The fungicides used in this research "in vitro" to determine the median effective dose (ED₅₀) of A. solani and T. harzianum strain T-39, were iprodione, folpet and folpet + prochloraz, which belong to different chemical groups. The method used was that of dilution consisting of the incorporation of the active ingredients into the nutrient medium (APD). The treatments were performed with four samples for each dose of fungicide and two repetitions. In addition, plates with APD were left without fungicide to be used as controls. Considering the ED₅₀ values obtained by fungicides with T. harzianum, it could be estimated as compatible for use with folpet and iprodione in applications alternated with the biocontroller T. harzianum.

Keywords : Trichoderma harzianum; Alternaria solani; iprodione; folpet and folpet + prochloraz; median effective dose (ED₅₀).