Effect of Temperature and Host Plant on the Development, Fertility and Longevity of Scirtothrips dorsalis Hood (Thysanoptera: Thripidae)

Abstract

The thermal requirements and temperature thresholds for development of Scirtothrips dorsalis were determined under constant temperature regimes. The developmental velocity was lineally related to temperature (14.5-29.5°C). The developmental minimum and maximum temperatures, the regression equation, the coefficient of determination (r2), and the degree-days for total development were 9.7°C, 32°C, D=0.00378T-0.003668, r2=0.9880, and 265 degree-days, respectively. The fertility of one female was ca. 50 eggs. From degree-days analysis, the annual number of generations was estimated to be between seven and eight in Shizuoka. Seasonal occurrence of S. dorsalis was monitored with sticky suction traps during 1984-1988 in satsuma mandarin (Citrus unshiu Marc.) groves at Shimizu, Shizuoka, Japan. The first three peaks of S. dorsalis adult emergence were related to degree-days accumulated from January 1. Development and longevity of the female reared on young leaves of sastuma mandarin, sweet viburnum (Viburnum awabuki K. Kogk), and tea (Thea sinensis L.) were observed. The developmental duration was not different among the three hosts, but the longevity of females on the sastuma mandarin leaves was shorter than that on the other hosts. © 1994, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.