title: Strategy of freeze tolerance in adult of sunn pest bug (Eurygaster integriceps Put.).
abstract: To investigate cold hardiness of Eurygaster integriceps Put, super cooling points of whole bodies during December to March 2006-2007 were measured on samples collected from altitude of Ghara-aghaj varamin-Iran. In addition, the lower lethal temperature (LLT) was determined for adult insect. The super cooling points were observed about -5 in cold months. Since the minimum temperature under natural condition is reached to-7 degreesC or lower in January and LLT99 (-21.65 degrees C), --11 degreesC lower than their minimum SCP (-10.5 degrees C), therefore I concluded that adult insects are freeze tolerant. Furthermore, super cooling points of different sex, weight and attitude were not significantly different. Freeze tolerance in these insects may be a strategy to provide protection from long-term exposures to ice crystals in microhabitat in alititude.
authors.affiliation: Department of Plant protection, Abourihan Campus, University of Tehran, Tehran-Iran. baghdadi@ut.ac.ir
authors.forename: Ahmed
authors.initials: A
authors.lastname: Baghdadi
mesh_terms: D000064:Acclimatization / Q000502:physiology*; D000704:Analysis of Variance; D000818:Animals; D003080:Cold Temperature; D005260:Female; D005615:Freezing; D006430:Hemiptera / Q000254:growth & development / Q000502:physiology*; D008297:Male; D012621:Seasons; D012737:Sex Factors