Diversity of Natural Enemy Fauna in Rice Ecosystem in Relation to Different Levels of Nitrogen

P. S. Sarao; M. S. Mahal; Debjani Dey

doi:10.18311/jbc/2008/3808

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Authors

P. S. Sarao
Department of Entomology, Punjab Agricultural University, Punjab, Ludhiana -141004 ,IN
M. S. Mahal
Department of Plant Breeding, Genetics and Biotechnology, Punjab Agricultural University, Punjab, Ludhiana-141004 ,IN
Debjani Dey
Division of Entomology, Indian Agricultural Research Institute, New Delhi -110012 ,IN

DOI:

https://doi.org/10.18311/jbc/2008/3808

Keywords:

Diversity, Insect Predators, Parasitoids, Nitrogen Level, Rice, Spider.

Abstract

Effect of nitrogen levels on the natural enemy fauna on rice variety PR118 was studied at Balloke village (Dist. Ludhiana) during kharif 2005 and 2006. The mean per cent populations of insect predators and parasitoids were higher at 103.69kg N ha^âˆ’1 (225kg urea), whereas spider fauna was more abundant at higher dose of nitrogen (172.81kg N ha^âˆ’1: 375kg urea). During 2005 and 2006, the overall diversity index in the crop season was higher (2.162 and 1.948, respectively) when higher dose of N was applied (172.81kg N ha^âˆ’1).