Qualidade de mudas de alface inoculadas com Trichoderma e reação de plantas adultas de alface a nematoides de galhas na presença de Trichoderma

Abstract

In order to evaluate the effect of Trichoderma isolates in lettuce cultivars two experiments were conducted, divided into two chapters. The first, in order to evaluate the effect of Trichoderma in lettuce seedlings, and the second, its potential in control of Meloidogyne enterolobii in lettuce adult plants. The first experiment was conducted in a greenhouse at the Federal University of Tocantins, in a factorial randomized design, with five repetitions. Three Trichoderma strains were used (UFT201, UFT202, and UFT205), and two commercial cultivars of lettuce (Elba and Solaris). For this experiment the following characteristics were evaluated: plant height, stem diameter, root length, number of leaves, dry weight of shoot and root, total dry weight, quality index Dickson and relative efficiency. For Chapter II two experiments were conducted with the use of Elba cultivars and Solaris, two isolates of Trichoderma UFT201 and UFT205, an isolate of nematode M. enterolobii and tomato cultivar Santa Clara, used as the default host a witness of the nematodes. The variables evaluated were: root length, diameter of the head, fresh root mass, fresh mass total shoot dry mass, relative efficiency, number of galls, average size of galls, positioning of galls, egg mass index and reproduction index. In the first experiment, in general the presence of Trichoderma did not result in better quality seedlings compared to the control. The time factor may play a role, since the work was done on seedlings. For the second experiment, there was a reduction in the number of galls and egg masses of nematodes in treatments inoculated with Trichoderma. By parameters that determine the presence of nematodes in the plant, it was established for both cultivars the antagonistic potential of Trichoderma to control M. enterolobii.