Evaluación, en condiciones de laboratorio, de la actividad insecticida de extractos Etanolicos de cinco especies de plantas sobre Tecia solanivora (Lepidoptera: Gelechiidae)

At the Laboratory of Biological Control of the Agronomy Facultity at the Universidad Nacional de Colombia, in Bogota, the insecticidal activity of an ethanolic extract from Berberis samacana, Berberis saboyana, Nycandra physaloides, Eucaliptus globulus and Salpichroa diffussa was evaluated. Extract were used 100, 1.000 and 10.000 ppm,to determine effects on the development of Tecia solanivora (Lepidoptera: Gelechiidae). The desing was a randomized completely, where the experimental unit were 500 grs of Solanum phureja, the units were sumerged in the plant extracts during five minutes and after evaporating the solvent, 15 1st instar larvae were placed to infested the potatoes. The variables measured were percentage of pupation, days of pupation, emergence of the adults and tubercule damage levels. The activity of the extracts began at 1.000 ppm, the extracts from E. globulus affects the pupation rate; damage was registered on the 1st and 2nd levels (O - 25 and 26 - 50 % respectively). On the units treated with the B sama cana extract, similar pupation rates were present, for the 20 and 25 days after the treatment (ddt); differences in the emergence of the adults were observed no as a result of the treatments.