Emergence and reproduction of spring-migrants of Schlechtendalia chinensis ( Bell )

Author of the article:SHAO Shu-Xia

Author's Workplace：Research Institute of Resource Insects，Chinese Academy of Forestry

Key Words： Schlechtendalia chinensis (Bell), spring migrant, emergence, migration, reproduction

Abstract：        The aim of the article is studying the emergence and reproduction of spring-migrants of Schlechtendalia chinensis (Bell) in order to provide scientific basis for the improvement of artificial cultivation techniques and increase production of horned gallnut. We put Plagiomnium maxmovizii (Lindb) T. Kop. bearing overwintering S. chinensis into 15-cm Petri dishes, and when spring-migrants of S. chinensis emerged, we put them into 5-cm petri dishes, one per Petri dish. By continuous observations, we studied spring-migrants of S. chinensis’ emergence, migration and reproduction process. The result showed that spring-migrants of S. chinensis could emerge and migrate all the day, but 42.96 % of them emerged at 19: 00. On the condition of 18 – 22 ℃, the migration process lasted for 6 days, and the amount of migrating aphids in the first 3 days was the largest, 73.05 % of total. Two hours after emergence, some spring-migrants began bearing sexuales, and the number of sexuales born in the first 24 hours was the largest, and was 84.61 % of the total. Spring-migrant could bear sexuales 1 - 4 times all its life, and 56.67 % of them bore sexuales for twice. There were positive correlations between bearing times and fecundity of spring-migrant. Sixty percent of spring-migrants not only bore male, but also female sexual aphids, 36.67 % of spring-migrants only bore male sexual aphids, and the rest (3.33 %) only bore female sexual aphids. The birth time of male was 2 hours earlier than that of female in average.