caa a22 4500 388036222 CHVBK 20180307125005.0 cr unu---uuuuu 161130e199804 xx s 000 0 eng 10.1017/S0007485300025773 doi S0007485300025773 pii (NATIONALLICENCE)cambridge-10.1017/S0007485300025773 Control of summer and winter diapause in Pidorus euchromioides (Lepidoptera: Zygaenidae) on Chinese sweetleaf Symplocos chinensis [Elektronische Daten] Pidorus euchromioides Walker has two separate diapauses during its life cycle, a winter diapause as a fourth larval instar and a summer diapause as a prepupa in a cocoon. Winter diapause was induced by short photoperiods. The critical day length of 13 h 20 min to 13 h 40 min at 23.3°C under insectary conditions was very similar to the critical day length (13 h 32 min) observed in the field. Sensitivity to day length was restricted to the first 9 days, corresponding to the first and second instars. The duration of larval diapause was not only strongly correlated with the inducing photoperiod, but also dependent on the number of short days experienced during the larval growth period. The shortest diapause occurred at the critical day length, or when the larvae were exposed for 6 days (a critical number of short days) to a photoperiod of LD 12 h:12 h. The summer diapause appeared to be primarily determined by a genetic factor and only occurred in part of the overwintering generation and the first generation. The two different diapause mechanisms play important roles. Winter diapause ensures that P. euchromioides synchronizes its development and activity with the phenology of specific host plants, and summer diapause provides the species with a high degree of adaptation to an unpredictable environment. Copyright © Cambridge University Press 1998 Fangsen Xue Department of Plant Protection, Jiangxi Agricultural University, Nanchang, Jianxi 330045, People's Republic of China Kallenborn H. G. Fachrichtung Zoologie, Universität des Saarlandes, Postfach 151150, D-66041, Saarbrücken, Germany Bulletin of Entomological Research Cambridge University Press 88/2(1998-04), 207-211 0007-4853 88:2<207 1998 88 BER https://doi.org/10.1017/S0007485300025773 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007485300025773 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fangsen Xue Department of Plant Protection, Jiangxi Agricultural University, Nanchang, Jianxi 330045, People's Republic of China NATIONALLICENCE 700 1- Kallenborn H. G. Fachrichtung Zoologie, Universität des Saarlandes, Postfach 151150, D-66041, Saarbrücken, Germany NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/2(1998-04), 207-211 0007-4853 88:2<207 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge