Búsqueda preliminar de fuentes de resistencia a T. solanivora en la Colección Central Colombiana de papa:

Abstract

In Colombia, the Guatemalan potato tuber moth Tecia solanivora (Povolny) (Lepidoptera: Gelechiidae) is one of the most limiting pests in potato production. Its management has been oriented to the intensive use of chemical insecticides with consequences such as pest resistance and negative effects on the environment and human health. An alternative and sustainable strategy for T. solanivora control is the varietal resistance This work focused on using the genetic diversity of the Colombian Central Potato Collection (CCC) to search for sources for insect resistance. A total of 132 CCC accessions were evaluated in no-choice experiments in the laboratory and in free-choice experiments in storage at CI Tibaitatá. Five genotypes were selected that consistently showed pest resistance traits. These materials were evaluated under field conditions to determine their response to T. solanivora damage with natural infestation in a producing municipality with high moth incidence. Significant differences were found among the materials evaluated (p<0,0001 F=10,54  gl=7). Genotypes 1815 and 2384 showed less damage and lower susceptibility, and the commercial varieties Perla Negra and Parda Pastusa showed susceptibility to the insect. Spearman's correlation test showed a relationship between moth incidence and flower intensity and primary color (p=0,74882 p=0,0325; p=-0,82479 p=0,0117). In terms of yield, accession 1815 showed the highest values. In conclusion, genotypes 1815 and 2384 stand out as promising for varieties or as valuable parents in a breeding program.