부산대학교 도서관

The litchi stink bug Tessaratoma papillosa is an invasive insect pest that destroys Sapindaceae plants in recent years. In Taiwan, Anastatus japonicus and Anastatus dexingensis are common native egg parasitoids of the litchi stink bug. In this study, we tested the parasitism effects of these two egg parasitoids under different temperatures ( 10, 15, 20, 25, 30, 35 ℃ ). Result showed that the parasitism trends of the two species under different temperatures were the same: The total number of progenies and female wasps were the highest at 30℃ , and no parasitism was unfavored at low temperatures (10, 15℃ ) and high temperature (35 ℃ ). The mean number of progenies per day of A. japonicus was 15.1 ± 0.3 in a 30℃ environment, followed by 11.4 ± 0.3 (25℃ ) and 6.1 ± 0.1 (20℃ ). The number of progenies per day for A. dexingensis was the highest at 30 and 25℃ , which were 6.2 ± 0.1 and 5.8 ± 0.2, respectively. The number of female progenies was the highest at 30 ℃ for A. japonicus , which was 10.6 ± 0.40, while the number of female progenies was the highest at 30 and 25℃ for A. dexingensis, which were 5.5 ± 0.1 and 5.2 ± 0.2, respectively. The total number of progeny and female wasps of A. japonicus were higher than that of A. dexingensis . Progeny sex ratio (♀/♀+♂) in these two wasps were decreased when they were under high or low temperatures, resulting in more male progeny.