Spatial Distribution of Cheilomenes sexmaculata (Fabricius), an Important Predator of Bean Aphid, Aphis craccivora Koch in Green Gram


Affiliations

  • Assam Agricultural University, Department of Entomology, College of Agriculture, Jorhat, Assam, 785 013, India

Abstract

Field studies were conducted to study the spatial distribution of Cheilomenes sexmaculata (Fabricius) during summer and kharif seasons, 2009 at instructional cum research farm of Assam Agricultural University, Jorhat, Assam. Various indices of dispersion were used to study the distribution pattern. In both seasons, the variance to mean ratios were found to be less than unity, dispersion parameter 'k' was less than 8 and David and Moore's indices of clumping were negative. Also, Lloyd's indices of mean crowding were less than mean and indices of patchiness were less than unity, indicating positive binomial (regular) distribution of C. sexmaculata at both larval and adult stages.

Keywords

Spatial Distribution, Green Gram, Aphis craccivora, Cheilomenes sexmaculata.

Subject Discipline

Agriculture Sciences

Full Text:

Refbacks

  • There are currently no refbacks.