ARTÍCULO
TITULO

Biological parameters of Cydnodromus picanus and Phytoseiulus persimilis raised on the carmine spider mite Tetranychus cinnabarinus (Acari: Phytoseiidae, Tetranychidae).

Víctor Tello    
Robinson Vargas    
Jaime Araya    
Antonieta Cardemil    

Resumen

The postembryonic development, consumption and life table parameters of Cydnodromus picanus Ragusa and Phytoseiulus persimilis (Athias-Henriot) were studied at 29.44 ± 1.47 °C and 42.35 ± 5.01% of RH with a photoperiod of 14:10 h (L:D) in order to evaluate the potential of these predators for feeding on the carmine spider mite Tetranychus cinnabarinus (Boisduval). Eggs, larvae and protonymphs of T. cinnabarinus may be optimal food for C. picanus, which obtained survival rates of 100%, 97% and 93%, respectively, on them. The survival of P. persimilis was around 6.7% with diets based on eggs, larvae and protonymphs, showing a high mortality level by dehydration when fed with eggs. The time of the postembryonic development was signifi cantly shorter (p < 0.05) for C. picanus than for P. persimilis when they were fed with eggs, larvae and deutonymphs of T. cinnabarinus. When fed with eggs and a combination of different stages of T. cinnabarinus, the intrinsic rate of growth (rm) was signifi cantly higher (p < 0.05) for C. picanus (0.289 and 0.307, respectively) than for P. persimilis (0.019 and 0.025, respectively). The values of the fi nite rate of growth (?) were also signifi cantly (p < 0.05) higher for C. picanus (1.34 and 1.36) than for P. persimilis (1.02 and 1.03) when they were nourished with eggs and a mixed diet, respectively. The high values of rm and ? found for C. picanus in the experimental conditions are indicators of the possible control that this phytoseiid mite, as a predator of T. cinnabarinus, would potentially offer under the conditions of lower relative humidity encountered in the arid zone of the desert of Chile. El desarrollo postembrionario, consumo y parámetros de tabla de vida de Cydnodromus (=Neoseiuslus) picanus Ragusa y Phytoseiulus persimilis (Athias-Henriot), fueron estudiados a 29,44 ± 1,47° C, 42,35 ± 5,01% de H.R. y un fotoperíodo de 14:10 h (L:O), para evaluar la potencialidad de estos depredadores sobre la arañita cinabarina Tetranychus cinnabarinus Boisduval. Los huevos, larvas y protoninfas de T. cinnabarinus pueden ser considerados alimentos óptimos para C. picanus obteniéndose una supervivencia de 100, 97 y 93%, respectivamente. La supervivencia de P. persimilis fue de alrededor del 6,7% con los mismos alimentos, presentando una alta mortalidad a nivel de huevos por deshidratación. La duración del desarrollo postembrionario de C. picanus fue signifi cativamente menor (P<0,05) que el de P. persimilis al ser alimentados con huevos, larvas y deutoninfas de T. cinnabarinus. La tasa intrínseca de crecimiento (rm) fue sinifi cativamente mayor (P<0,05) para C. picanus (0,289 y 0,307) que para P. persimilis (0,019 y 0,025) alimentados con huevos y una mezcla de diferentes estados de T. cinnabarinus, respectivamente. Los valores de la tasa fi nita de crecimiento (?) también fueron signifi cativamente (P<0,05) mayores para C. picanus (1,34 y 1,36) que para P. persimilis (1,02 y 1,03) al alimentarlos con huevos y dieta mixta, respectivamente. Los valores altos de rm y ? registrados para C. picanus en las condiciones experimentales son indicadores del posible control potencial que presentaría este fi toseido como depredador de T. cinnabarinus en condiciones de baja humedad relativa que son encontradas en las zonas áridas del desierto de Chile.

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