Evaluation of <i>Trichoderma</i> spp. Isolates in Cocoa Seed Treatment and Seedling Production
Willian Nogueira de Sousa | Nayane Fonseca Brito | Cristina Aledi Felsemburgh | Thiago Almeida Vieira | Denise Castro Lustosa
Isolates of <i>Trichoderma</i> spp., a soil fungus, has been used to control diseases and promote plant growth, reducing the use of chemicals in the production of seedlings of different plant species. We evaluated the effect of some <i>Trichoderma</i> spp. isolates on seed treatment and seedling production of <i>Theobroma</i><i>cacao</i>. Five isolates from the Amazon region were tested. In laboratory, the following variables were evaluated for seed treatments: germination, germination speed index, radicle and hypocotyl lengths, and fungi incidence. In nursery, the following forms of application were tested: via seeds; in the substrate at pre-planting; monthly in post-planting substrate, and also their combination. The following was evaluated: height, diameter, number of leaves, root length, leaf area, and shoot dry mass and root system. Inoculation with <i>Trichoderma</i> increased the length of the radicle and hypocotyl and showed no fungi in the seeds. In seedlings, some treatments increased height and plant root dry mass. The use of <i>Trichoderma</i> was beneficial for seeds and appeared favorable for <i>T. cacao</i> production.
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