Impact of Weather Factors on Population Fluctuation of H. armigera on Sunflower

Authors

  • Khalid Zafar Department of Agricultural Entomology, University of Agriculture, Faisalabad, Pakistan
  • Anjum Suhail Department of Agricultural Entomology, University of Agriculture, Faisalabad, Pakistan
  • M. Arshad Department of Agricultural Entomology, University of Agriculture, Faisalabad, Pakistan
  • M. Jalal Arif Department of Agricultural Entomology, University of Agriculture, Faisalabad, Pakistan

DOI:

https://doi.org/10.3923/pjn.2013.50.54

Keywords:

Correlation, genotype, H. armigera, sunflower, weather factors

Abstract

Studies were conducted to ascertain the effect of the weather factors on incidence and development of H. armigera on different sunflower genotypes during 2008-2009. The H. armigera population was built up progressively from April 12 to April 27 in terms of egg count. The larval population started to increase continuously from April 12 to May 01 and a tremendous decrease was observed thereafter. The results reveal that maximum temperature during 2009 showed significant and positive correlation r-value of 0.514** with the egg counts of H. armigera. Whereas, on cumulative basis relative humidity and rainfall had negative and significant correlation with the eggs count with r-values of -0.525** and -0.479*, respectively. It is evident that a maximum larval population was recorded to be 5.64 per 5 plants on April 24, 2009. The determination of the effects of different weather factors on egg count and larval population of H. armigera in sunflower is essential for effective management of this pest.

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Published

15.12.2012

Issue

Vol. 12 No. 1 (2013)

Section

Research Article

License

Copyright (c) 2013 Asian Network for Scientific Information

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

How to Cite

Zafar, K., Suhail, A., Arshad, M., & Arif, M. J. (2012). Impact of Weather Factors on Population Fluctuation of H. armigera on Sunflower. Pakistan Journal of Nutrition, 12(1), 50–54. https://doi.org/10.3923/pjn.2013.50.54