caa a22 4500 386360944 CHVBK 20180307111914.0 cr unu---uuuuu 161130e198901 xx s 000 0 eng 10.4039/Ent12165-1 doi S0008347X00028509 pii (NATIONALLICENCE)cambridge-10.4039/Ent12165-1 DIAPAUSE TERMINATION AND MORPHOGENESIS OF HOLCOTHORAX TESTACEIPES RATZEBURG (HYMENOPTERA: ENCYRTIDAE), AN INTRODUCED PARASITOID OF THE SPOTTED TENTIFORM LEAFMINER, PHYLLONORYCTER BLANCARDELLA (F.) (LEPIDOPTERA: GRACILLARIIDAE) [Elektronische Daten] Low temperature is a major factor regulating diapause development in Holcothorax testaceipes Ratzeburg. Diapausing pupae required a cold period of 0°C, 5°C, or outdoor (≤0°C) for ca. 15 weeks to terminate diapause. The pupae required a further 21-27 days at 21°C for 50% emergence. Longer periods and higher temperatures of storage often were associated with shorter times of morphogenesis and duration of emergence. Percentage emergence of H. testaceipes was constant after various periods of cold storage at low temperatures. After storage at 0°C, pupae held at 21°C and a 16-h photophase reached 50% emergence sooner than those held at the same temperature but at a 12-h photophase. Photoperiod did not affect percentage or duration of emergence of the parasitoid. The threshold temperature for development of pupal H. testaceipes was estimated to be 9°C regardless of sex or host species. The thermal constant did not vary with sex of the parasitoids but differed significantly for H. testaceipes reared on Phyllonorycter ringoniella Matsumura (237 DD) and on Phyllonorycter blancardella (F.) (202 DD). Temperatures from 11 to 29°C did not affect percentage and duration of emergence from overwintered pupae, which were 75.5% and 2.4 days respectively, when reared on P. ringoniella, and 86.2% and 1.7 days respectively, on P. blancardella. These results suggest that H. testaceipes accepts P. blancardella as a host and will be synchronized with its development in Ontario. Copyright © Entomological Society of Canada 1989 Wang T. Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1 Laing J.E. Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1 The Canadian Entomologist Cambridge University Press 121/1(1989-01), 65-74 0008-347X 121:1<65 1989 121 TCE https://doi.org/10.4039/Ent12165-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent12165-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang T. Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1 NATIONALLICENCE 700 1- Laing J.E. Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 121/1(1989-01), 65-74 0008-347X 121:1<65 1989 121 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge