Efecto de dos cepas de Trichoderma sp., ácido salicílico y su combinación, en el control de Sclerotinia sclerotiorum y en el desarrollo y crecimiento de plantas de lechuga

The objective of this work was: to evaluate the effect of two strains of Trichoderma sp., applications of salicylic acid and its combination for the control of S. sclerotiorum and its effect on the development and growth of lettuce plants under greenhouse conditions. The tests were carried out in an experimental greenhouse of the Facultad de Ciencias Agrarias y Forestales. Lettuce seeds of the “Gallega” variety were used. Eighteen treatments were carried out with 10 plants each. The first 9 were framed within a scenario of ABSENCE of the pathogen to determine the effect of the different treatments on the growth and development of the plants taking into account the possible positive effects of Trichoderma sp., salicylic acid and their combination on the dry weight , fresh and chlorophyll content, while treatments 9-19 were implemented in the PRESENCE of the pathogenic agent to determine the efficiency of the treatments in controlling neck rot. In the treatments with Trichoderma (Tri 22) and with the application of 200 μM AS, significant differences in fresh weight were evident. Regarding dry weight, there were no significant differences between treatments. Furthermore, the results show that there is no effect on the chlorophyll content of the leaves. It was observed that the treatment of 10 µM of AS and strain 22 of T. harzianum showed the lowest values of incidence and severity of lettuce rot at 14 days.