Effects of Temperature on Development of the Chillie Thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae), on Grape

Abstract

The effects of temperature on the development of Scirtothrips dorsalis on grape were examined at constant temperatures of 16, 20, 25 and 30°C (under 16L8D). The developmental zero and effective accumulative temperature from oviposition to adult emergence were obtained as 8.5°C and 294.1 degree-days (DD), respectively. The relationships between the number of adults on grape and the cumulative degree-days from 1991 to 1993 were analyzed. The first adults immigrated into vineyards at about 250 DD above the effective temperature. The first and second peaks occurred at about 550 and 850 DD, respectively, each of which apparently corresponded to the first and second generations. Above 1,000 DD, although observed, peaks were not related with generations because generations overlapped.