Spatial distribution of thrips, Thrips palmi Karny on potato (Solanum tuberosum) under subtropical conditions of Madhya Pradesh

ANUJ BHATNAGAR

Abstract


A field experiment was carried out during 2006-07 and 2007-08 at Central Potato Research Station (CPRS), Gwalior, India to study the spatial distribution of thrips (Thrips palmi Karny) in potato (Solanum tuberosum) crop. The various indices of dispersion, viz., variance mean ratio, exponent k and common k (kc), Lloyds indices of mean crowding (x*) and patchiness index ( x * x ) and Taylors power law revealed that the potato thrips exhibited aggregated or contagious pattern of distribution in the field. In study of Taylors power law, slop parameter (b = 0.7617 and 0.702 for respective years) was < 1 indicating contagious distribution. This also indicates that thrips population followed negative binomial distribution pattern as an alternative of poisson or random distribution. The intercept also justified that the distribution of thrips was contagious in nature. Spatial distribution parameters are useful to out line the sampling programme as well as to estimate the population density of T. palmi.

Keywords


Potato, spatial distribution, Solanum tuberosum, Thrips palmi

Full Text:

PDF

Refbacks

  • There are currently no refbacks.


=====================================================================

PMHE, Pest Management in Horticultural Ecosystem. 2013 © Association for Advancement of Pest Management in Horticultural Ecosystems, all right reserved.
Use of this website signifies your agreement to the Terms of Use.

Concept Conceived By: Chief Editor and Online Team,AAPMHE
Executed By: Thippeswamy S, Asst. Chief Technical Officer
ICAR-IIHR,Bengaluru-89

Proudly powered by OJS