Biologyical study of the oak pit scale insect, Asterodiaspis quercicola (Hem: Asterolecaniidae) of Ghalajeh oak forests of Kermanshah

Document Type : Short paper

Authors

Department of Plant protection, Agricultural College , Razi Uni., Kermanshah, Iran

Abstract

The pit scale insect, Asterodiaspis quercicola (Hem: Asterolecaniidae) is restricted to oak tree, Quercus brantii and it is now prevalent in Zagros oak forest region. The biology of this pest in natural conditions was investigated on Quercus brantii (Fagaceae) during 2015-2016, for the first time in Iran (Ghalajah forests, West Islamabad). The results of this study showed that this insect is a univoltine species and overwintered as pre-reproductive female. Eggs begin to hatch in the middle of May. After one week, the crawler dispersal takes place. The egg population pick is in early July and declines in late July. The incubation and nymphal period take 23±1 and 92±2 days in average, respectively. Egg incubation time plus nymphal period take 115±1 days and the adult longevity is 53±2 days. The reproductive female starts to egg laying early April, and ends on the early August. The adult females develop through two nymphal stages; the first and second nymphals stages emerge in the late May and late June, respectively; this period lasts to the end of September. Meanwhile, the population pick of egg, first instar, second instar, pre- and post-reproductive female appears on early July, mid-July, mid-August, end of September and mid-May, respectively.
 
 

Keywords

References

-      Fatahi, M. 1994. Investigation of Zagros oak forests and the most important factors of its degradation. Iranian Journal of Forest and Range Protection Research, 64p.
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-      Naderishahab, M.A. 2012.The Oaks of Iran. Azadpyma Publishers, 306p (In Persian).
-      Podsiadlo, E. 1986. Inter relation of the scale insects from the genus Asterodiaspis Signoret and their encyrtid parasites in Poland. Bollettino del Laboratorio di Entomologia Agraria "Filippo Silvestri" Italy 43(supplement), 185-188.
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Iranian Journal of Forest and Range Protection Research
Volume 16, Issue 1 - Serial Number 31
September 2018
Pages 122-127

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History

  • Receive Date: 06 November 2017
  • Revise Date: 18 September 2018
  • Accept Date: 02 July 2018

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