P. S. Sarao ¹, M. S. Mahal ², Debjani Dey ³

Affiliations
1 Department of Entomology, Punjab Agricultural University, Punjab, Ludhiana -141004, IN
2 Department of Plant Breeding, Genetics and Biotechnology, Punjab Agricultural University, Punjab, Ludhiana-141004, IN
3 Division of Entomology, Indian Agricultural Research Institute, New Delhi -110012, IN

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⁻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).

Keywords

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

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M. S. Mahal ¹, V. K. Kajal ¹, Ramandeep Kaur ¹, Rajwant Singh ¹

Affiliations
1 Department Of Entomology, Punjab Agricultural University, Ludhiana, 141 004, Punjab, IN

Abstract

Efficacy of various control measures for the management of leaffolder, Cnaphalocrocis medinalis Guenee and stem borer, Scirpophaga incertulas Walker was evaluated in large scale field trials at farmers' fields in village Karnikhera (Disst. Ferozepur) on Pusa Basmati 1121 during kharif 2003 and 2004. Integration of one application of cartap hydrochloride 4G@ 1.0 kg a.i/ha 30 days after transplanting with weekly tagging of trichocards (Trichogramma chilonis Ishii and T. japonicum Ashmead @ 20,000/0.4ha each) during the crop season was the most effective approach in reducing the leaf folder and stem borer incidence. It gave higher grain yield than the untreated control and non-IPM farmers' fields and also showed maximum cost benefit ratio (1:5.08) as against the recommended three applications of cartap hydrochloride 4G (1:1,81).

Keywords

Basmati Rice, Biological Control, Chemical Control, Cnaphalocrocis medinalis, Non-IPM Farmers Scirpophaga incertulas.

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