Rearing Ooencyrtus cf. masii, (Hym.: Encyrtidae), the egg parasitoid of Ocneria terebinthina (Lep.: Lymantridae) on non-target hosts

Document Type : Research Paper

Authors

Abstract

Ocneria terebinthina (Lep.: Lymantridae) is one of the most important pests of wild pistachio and occasionally pistachio in Iran. Up to 65% damage has been reported to leaves and fruits of the host trees. Restrictions on chemicals application calls for allernation biological approches. One of the most important natural enemies of this pest is Ooencyrtus masii (Hym.: Encyrtidae). Primary studies have shown important role of the parasitoid in controlling the pest (up to 30%). This research has been conducted to rear the wasp on alternative hosts in laboratory condition. All of the experiments was conducted in controlled condition (25 2 °C, 705 % R.H. and 16 L: 8D). Different stages of O. terebinthina were collected from Khojir region near Tehran. O. terebinthina eggs and also alternative host eggs such as Bombyx mori, Galeria melonella, Sitotroga cerealella, Lymantria dispar and Graphosoma lineatum were used for wasp rearing. Parasitism percentage and a number of survival parameters of the wasp were studied on G. lineatum. Results showed that O. terebinthina larvae could not survive on any artificial diets. O. masii did'nt show any interest for ovipositing on eggs of Galeria melonella, Sitotroga cerealella and Lymantria dispar eggs. Parasitism occurred only on G. lineatum and B. mori eggs. Parasitism percentage and biological parameters of O. masii were studiedon daily G. lineatum eggs. Mean of larval period on G. lineatum eggs was 15.6 0.7 day. Female and male wasps longevity on G. lineatum eggs were 28.5  4.5 and 26.6  2.6 days, respectively. Sex ratio of emerged wasps from G. lineatum eggs was 1:1. Parasitism on G. lineatum eggs began on 10th day and the highest parasitism percentage occured on 12th day. Results showed that G. lineatum eggs could be used for colony conservation of the parasitoid in laboratory
 

Keywords

References

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Iranian Journal of Forest and Range Protection Research
Volume 3, Issue 2
December 2006
Pages 129-144

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History

  • Receive Date: 21 May 2004
  • Revise Date: 11 June 2016
  • Accept Date: 23 August 2005

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