Antagonism of Saccharicola sp., against phytopathogens of the root of jalapeno pepper (Capsicum annuum)
Abstract
The antagonist capacity of Saccharicola sp against Phytophthora capsici, Fusarium oxysporum and Rhizoctonia solani was evaluated in vitro and under greenhouse conditions. Through dual confrontation tests its impact was evaluated on the pathogen´s growth and the number of days when the antagonist invaded the pathogen mycelia, and also the viability of the invaded mycelia, and the production of pathogen propagules was determined. Saccharicola sp caused a reduction of 44.8 % and 45.1 % in P. capsici and F. oxysporum growth 3 days after confrontation (dac), and 36.2 % in R. solani at 2 dac. The microculture technique was used to determine its mycoparasitic potential. At 72 h, the antagonist winded around P. capsici mycelia. In R. solani starting at 24 h ac, different types of clefts were observed on its walls, at the points where it was in contact with the antagonist. Although Saccharicola sp in vitro conditions showed a negative effect against phythopathogens and there was evidence of mycoparasitism, under greenhouse conditions disease incidence and severity did not decrease nor promoted plant growth.
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