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Tecia solanivora is one of the most limiting potato pests and the use of granulovirus constitutes a promissory alternative for its control. A biopesticide based on a granulovirus isolate from Peru is manufactured in Colombia, for controlling the pest under storage conditions. In a previous work, three native granulovirus from T. solanivora larvae from the localities of Choconta, Mosquera and Carmen de Carupa of the Cundinamarca department were isolated. These native strains could be better adapted to both the host and the environmental conditions of the country. In the present work the three native isolates of granulovirus were evaluated formulated and unformulated under laboratory conditions by using a bioassay and were compared with the Peruvian strain. The formulated native viruses presented the highest efficacy with results between 88% and 100%, while the Peruvian isolate obtained 88%. These results were significantly different from the obtained with the unformulated virus isolates, for which the efficacy ranged between 36% and 86% for native isolates and was 59% for the Peruvian strain. The concentration of occlusion bodies (OB) produced per milligram of larva tissue was measured and no significant differences between the isolates were observed. The average yield was 4.4 x 107 OB/mg larvae. Results allowed to select the native isolate from Mosquera (Cundinamarca) for a future biopesticide development for presenting the highest virulence levels.

Comparación de la eficacia y la productividad de tres granulovirus nativos sobre larvas de Tecia solanivora (Povolny) (Lepidoptera: Gelechiidae)