caa a22 4500 397547072 CHVBK 20180308164741.0 cr unu---uuuuu 161202e19960901xx s 000 0 eng 10.1093/aesa/89.5.661 doi (NATIONALLICENCE)oxford-10.1093/aesa/89.5.661 Temperature and Moisture Effects on the Success of Egg Hatch in Trirhabda geminata (Coleoptera: Chrysomelidae) [Elektronische Daten] [James A. Bethke, Richard A. Redak] Eggs of Trirhabda geminata (Horn) were subjected to several constant temperatures (15, 22, 25, and 30°C) and moisture (wet or dry for varying lengths of time) regimens. Upon wetting, eggs changed color (from brown to yellow-orange) and swelled from 1.07 by 0.64 to 1.14 by 0.72 mm (length by width). Warmer temperatures shortened embryonic development time for eggs held wet. Eggs that were continuously held dry did not develop. A chilling requirement or diapause was not required for successful hatch. Optimal temperature for egg survival (98%) was 25°C. Some eggs hatched at all temperature regimens as long as they were in contact with a moisture source. The longer the period that eggs were held dry, however, the greater the decrease in survivorship. Approximately 10% of eggs held dry for extended periods (322 d) are still able to hatch when moistened. Our results indicate that moisture is required for egg development and is likely used as a proximal stimulus by T. geminata for the availability of its host plant. © 1996 Entomological Society of America Ecology and Population Biology nationallicence Coleoptera nationallicence Trirhabda geminata nationallicence Encelia farinosa nationallicence eggs nationallicence dormancy nationallicence diapause nationallicence Bethke James A. Department of Entomology, University of California, Riverside, CA 92521. aut Redak Richard A. Department of Entomology, University of California, Riverside, CA 92521. aut Annals of the Entomological Society of America Oxford University Press 89/5(1996-09-01), 661-666 0013-8746 89:5<661 1996 89 aesa https://doi.org/10.1093/aesa/89.5.661 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/aesa/89.5.661 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bethke James A. Department of Entomology, University of California, Riverside, CA 92521 aut NATIONALLICENCE 700 1- Redak Richard A. Department of Entomology, University of California, Riverside, CA 92521 aut NATIONALLICENCE 773 0- Annals of the Entomological Society of America Oxford University Press 89/5(1996-09-01), 661-666 0013-8746 89:5<661 1996 89 aesa Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford