Evaluación de resistencia a Bactericera cockerelli šulc. en accesiones silvestres de papa del Banco de Germoplasma del Ecuador

Abstract

In Ecuador, the potato psyllid Bactericera cockerelli affects several solanaceous crops, especially potatoes, causing losses and economic damage that in some cases could reach up to 100%. The objective of this research was to evaluate the resistance response to Bactericera cockerelli Šulc. in eight wild potato accessions from the Ecuadorian germplasm bank with two controls (one eggs infested and the other without infestation). A completely randomized design with five observations was used. Each wild specie was placed in a cage where a pair of Bactericera cockerelli Šulc insects was placed in which the antibiosis resistance response was determined through evaluating the number of eggs laid by the insects on the plant leaves. On the other hand, the abundance of eggs was evaluated. Based on the analysis of variance carried out on the first three evaluations, it was observed that there were no statistical differences. However, in the fourth and last evaluation, the analysis of variance established significant statistical differences between accessions in reference to the number of eggs. For the separation of means, the Tukey test was performed at 5%. The results showed that the species whit antibiosis resistance characteristics were Solanum albornozii and Solanum minutifolium, in terms of the abundance of eggs laid by the insects, the species showed that at 11 days there was a greater number of eggs in the species. Concluding that, there was variation for the antibiosis resistance response that could be used in a breeding program for the development of a resistant variety.