Granulovirus formulations efficiently protect stored and field potatoes from Phthorimaea operculella and Tecia solanivora in Costa Rica |
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Authors: | Yannery Gómez-Bonilla Miguel López-Ferber Primitivo Caballero Rosa Murillo Delia Muñoz |
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Institution: | 1. Instituto Nacional de Investigación y Transferencia de Tecnología Agropecuaria (INTA), San José, Costa Rica 2. Ecole des Mines d′Ales, 6 Avenue de Clavières, 30319, Alès Cedex, France 3. Departamento de Producción Agraria, Universidad Pública de Navarra, 31006, Pamplona, Spain 4. Instituto de Agrobiotecnología, CSIC-Gobierno de Navarra, 31192, Mutilva Baja, Spain
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Abstract: | The control efficiency of a Phthorimaea operculella granulovirus isolate from Costa Rica (PhopGV-CR1) against the concurrent insect pests P. operculella (Zeller) and Tecia solanivora (Povolny) (Lepidoptera: Gelechiidae) was evaluated. In warehouses, the best control efficiency was achieved with a powder formulate applied inside bags, which reduced injury over 70 % compared with the untreated controls. In the field, liquid and powder virus formulations significantly reduced injury between 56.2 and 81.7 % compared with the untreated controls, and were as efficient as chemical treatments. The efficiency of formulations stored at ?20 °C for six months (liquid) or at ambient temperature for three months (powder) was maintained, but higher temperatures and/or longer exposure times resulted in loss of pathogenicity. The data presented here favor the inclusion of granulovirus formulations of PhopGV-CR1 in Integrated Pest Management programs against tuberworms in Costa Rica and give clues on storage conditions for the growers in this country. |
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