Spatial distribution of Italian locust, Calliptamus italicus (Orthoptera: Acrididae) in Khodafarin region, northwest of Iran

Document Type : Research Paper

Authors

1 Professor, Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

2 Former M. Sc. Student, Department of Plant Protection, Faculty of Agriculture, Islamic Azad University, Tabriz Branch, Tabriz, Iran

3 Professor, Department of Plant Protection, Faculty of Agriculture, Islamic Azad University, Tabriz Branch, Tabriz, Iran

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

Abstract

Annual aggressions of Italian locust, Calliptamus italicus (Linnaeus) (Orthoptera: Acrididae) at the gregary phase cause serious damages and reduce yields in crop production systems in Khodafarin region. Despite a long history of the pest in the region, no sampling program has been developed for its population estimate and management. During growing season 2011, the spatial distribution of the post-embryonic stages of this insect was studied as a major component of a sampling program. The discrepancy of sampling data from both poisson and negative binomial distributions was investigated using Pearson's Chi square test. Moreover, different crowding and contagiousness indices including dispersion index (ID), index of clumping of David & Moore (lDM), green index (Cx), mean crowding of Lloyd (x*), patchiness index of Lloyd (Ip), Arbous and Kerich's λ, Morisita index (lδ) were used to strengthen the analyses. Taylor's power law and Iwao's regression techniques also were used to create a relation between means and variances. Results revealed that all stages have an aggregation tendency. Arbous and Kerrich's λ index was>2 in all samples and according to Blackith, it may suggest a combination of a behavioral cause of aggregation as well as an environmental one.

Keywords

References

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History

  • Receive Date: 27 June 2015
  • Revise Date: 05 April 2017
  • Accept Date: 22 April 2017

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