Effect of temperature on development, mortality, fecundity and reproduction of Tuberolachnus salignus on weeping willow (Salix babylonica) and corkscrew willow (Salix matsudana)

Abstract

The development time, survivorship and reproduction of Tuberolachnus salignus (Gmelin) (Hemiptera: Aphididae) [Lachninae, Lachnini] were studied on Salix babylonica (weeping willow) and Salix matsudana (corkscrew willow) at five constant temperatures (17.5, 20, 22.5, 25 and 27.5 degrees C). The development time of immature stages of T salignus ranged from 14.56 days at 17.5 degrees C to 12.50 days at 25 degrees C on S. babylonica, and 16.47 days at 20 degrees C to 12.28 days at 25 degrees C on S. matsudana. The total survivorship of immature stages of T salignus varied from 28% to 85% at 22.5 and 17.5 degrees C, respectively, on S. babylonica, and from 13% to 63%, respectively, at 17.5 and 25 degrees C on S. inatsudana. The greatest mtnns1c rate of increase occurred at 25'C on S. bab.vlonica (0.2691) and also on S. inatsudana (0.2607). The mean generation time of the aphid population ranged from 14.15 days at 25 inverted perpendicular C to 16.24 days at 17.5 degrees C on S. babylonica, and from 14.33 degrees C days at 25 degrees C to 19.86 days at 20 degrees C on S. matsudana. The optimal temperature for S. bab.illonica growth, development time, reproduction and percent survival was 25 degrees C.