Name: PAULA ABIKO NAVARRO CARRION
Publication date: 16/02/2023
Examining board:
Name |
Role |
|---|---|
| EDILSON ROMAIS SCHMILDT | Examinador Interno |
| EDNEY LEANDRO DA VITORIA | Presidente |
| THIAGO DE FREITAS FERREIRA | Examinador Externo |
Summary: The papaya tree is very important for national fruit growing, especially for the regional
economy, with Espírito Santo as the largest producer. The occurrence of nematodes
in the crop has already been reported, however, their impacts on production have not
yet been properly quantified. The objective of this work was to evaluate the resistance
of Carica papaya L. 'Aliança' to the species Meloidogyne incognita and M. javanica
and the development of plants under the effect of two types of fertilization before the
reproduction of these pathogens. Two experiments were carried out in a greenhouse,
the first in randomized blocks, with six treatments, two replications and a 3x2 factorial
scheme, until the production phase. In the second, to evaluate seedlings, a completely
randomized design was used, with three treatments and 14 replications. The
vegetative growth of the plants was evaluated by periodic measurements of plant
height, number of leaves, stem diameter and number of flowers and fruits (when
present). At the end, the mass of shoots and fresh roots, root length (only in the second
experiment), as well as the final population of nematodes in the root and soil and the
reproduction factor for each species were measured. Analyzes of variance and Tukey's
test at 5% were performed using the R software. Papaya 'Aliança', according to
Oostenbrink's criteria, was considered susceptible in adulthood and resistant in
seedlings. Despite being a host of these pathogens, at the population level obtained,
the growth and production variables were not affected, indicating that 'Aliança' is
tolerant to the presence of these nematodes. As for the fertilizers used, the one that
contained seaweed extract in its composition proved to be effective in reducing the
reproduction factor for the two studied species
