1Department of Entomology, Punjab Agricultural University, Punjab, Ludhiana -141004, India.
2Department of Plant Breeding, Genetics and Biotechnology, Punjab Agricultural University, Punjab, Ludhiana-141004, India.
3Division of Entomology, Indian Agricultural Research Institute, New Delhi -110012, India. E-mail: preetento@yahoo.co.in
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−1 (225kg urea), whereas spider fauna was more abundant at higher dose of nitrogen (172.81kg N ha−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−1).
Diversity, insect predators, parasitoids, nitrogen level, rice, spider
