Trends in Biosciences

  • Year: 2009
  • Volume: 2
  • Issue: 1

Spatial Distribution of Plume Moth, Exelastis atomosa (Wals) on Cajanus cajan (L. Millsp.)

  • Author:
  • S. Subharani1, T.K. Singh2
  • Total Page Count: 3
  • DOI:
  • Page Number: 20 to 22

1Distributed Information Sub Centre (DISC), Institute of Bioresources and Sustainable Development Takyelpat, Imphal, 795001. E-mail: subharani_devi@yahoo.co.in

2Entomology Research Laboratory, Manipur University, Canchipur, 795003. E-mail: tksingh06@yahoo.co.in

Abstract

Studies were conducted on the spatial distribution of E. atomosa infested flower and pods in the experimental field of Life Sciences Department, Manipur University. Various indices of dispersion such as variance, variance to mean ratio, Lloyd's index of patchiness, mean crowding, Iwao's regression and Taylor's power law were evaluated to study the distribution pattern. Distribution pattern of E. atomosa followed contagious behaviour of distribution on pigeon pea crop during both the years. The clumping behaviour of distribution in most of the cases was due to environmental heterogeneity and active behaviour of the pests’ species.

Keywords

Spatial distribution, Exelastis atomosa, pigeon pea, distribution