Developmental rates of the Lappet Moth Streblote panda Hübner (1820) (Lepidoptera: Lasiocampidae) at constant temperatures

Abstract

Streblote panda Hübner [1820] (Lepidoptera: Lasiocampidae) is a potential pest of forest, floricultural and horticultural plants. This paper reports the rate of development of this species at six constant temperatures between 16.0 and 31.0°C (3°C increments). Individuals were monitored daily and egg, larval and pupal development times recorded. The development rate was calculated as the reciprocal of the median number of days required to complete development. Linear regression methods were used to estimate lower temperature thresholds and the number of degree-days (DDs) needed for the development of each stage (and total development) under these laboratory conditions. The average hatching time was 18.0 days at 16°C and 7.2 days at 31°C; the average larval development time was 131.8 days at 16°C and 31.7 days at 31°C. The egg-to-adult development time ranged from 189.0 days at 16°C to 48.5 days at 31°C. The threshold temperatures were 7.9, 11.9, 12.5 and 11.3°C for egg, larval, pupal and egg-to-adult development respectively. Differences between larval instars were found; threshold temperatures were lower for late instars. The number of degree days (DDs) for egg-to-adult development was estimated at 1000.0 above 11.9°C. The results suggest three full generations are possible per year in SW Spain.Additional key words: degree-days, generations, growth rate, life stages, phenology. ResumenTasas de desarrollo de la especie Streblote panda Hübner [1820] (Lepidoptera: Lasiocampidae) a distintas temperaturas.Streblote panda Hübner [1820] (Lepidoptera: Lasiocampidae) es una especie de distribución mediterránea, que ha sido catalogada como plaga potencial de diferentes plantas con interés forestal, ornamental o agrícola. Se estudió la influencia sobre las tasas de desarrollo de la especie a seis temperaturas constantes, desde 16,0 a 31,0°C, con 3°C de incremento. Las orugas fueron observadas diariamente, registrándose los tiempos de desarrollo para los estadios de huevo, larva y pupa. Las tasas de desarrollo se calcularon usando el inverso de la mediana de los días requeridos para completar el desarrollo. Se determinaron, mediante regresiones lineares, las temperaturas mínimas cardinales de desarrollo y los requerimientos de días-grado (DG) bajo condiciones de laboratorio para cada estadio. Los tiempos medios de desarrollo registrados para el estadio de huevo oscilaron desde 18,0 días a 16°C hasta 7,2 días a 31°C. El desarrollo larvario se completó en un tiempo medio que fluctuó entre los 131,8 días a 16°C y 31,7 días a 31°C. El desarrollo total registrado de la especie, de huevo a adulto, osciló entre los 189,0 días a 16°C hasta 48,5 días a 31°C. La temperatura mínima cardinal de desarrollo obtenida fue de 7,9, 11,9, 12,5 y 11,3°C para huevo, larva, pupa y desarrollo total respectivamente, siendo esta temperatura menor para los últimos estadios larvarios. Se encontraron diferencias significativas en el tiempo de desarrollo entre estadios larvarios. Los requerimientos de DG para el desarrollo total de S. panda fu...

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