Life history of the new weevil species producing trehala Larinus trehalanus (Col.: Curculionidae) on the medicinal plant Cousinia stocksii (Asteraceae) in Kerman region, Iran

Document Type : Research Paper

Authors

1 Former M. Sc. Student, Department of Plant Protection, Faculty of Agriculture, Mohaghegh Ardabili University, Ardabil, Iran

2 Associate Professor, Department of Plant Protection, Faculty of Agriculture, Mohaghegh Ardabili University, Ardabil, Iran

Abstract

Weevil species Larinus spp. produce trehala on medicinal plants family of Asteraceae. In this investigation, the biology of weevil Larinus trehalanus G & Sh, was studied as a new species, on the medicinal plant Cousinia stocksii (Asteraceae)in Kerman region under field conditions during 2011 and 2012. The weevil is a univoltine insect, which annually overwinters as an adult. The female insects put their eggs individually on the host's stems, and cover then with their extinctions to protect the dry and natural enemies. The newly hatched larvaefrom eggs penetrate into the host plant stem by digging holes and start feeding on the plant sap. The larvae build trehala on host plant stem. They grow individually inside the trehala capsule. Only one larva grows inside each trehala capsule. In natural conditions, the development of L. trehalanus from egg to emerging adult takes 45.8±0.7 to 46.5±0.5 days. A new generation of adults spent some time on the host plant and then search for a protected site to pass the autumn and winter.

Keywords

References

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Iranian Journal of Plant Protection Science
Volume 48, Issue 2 - Serial Number 2
February 2018
Pages 367-370

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History

  • Receive Date: 19 July 2016
  • Revise Date: 23 December 2017
  • Accept Date: 19 December 2017

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