1Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu-641003, India
2Tamil Nadu Rice Research Institute, Aduthurai-612101
3Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu-641003, India
*Email: anitavsable@gmail.com
Online published on 31 December, 2014.
Studies on survival and population buildup of Nilaparvata lugens on some selected rice genotypes was carried out in glasshouse. On 40 day old plants, BPH population recorded at 40 days after infestation ranged from 0 to 141 insects/plant on selected genotypes whereas TN1 recorded the highest population of 312 insects/plant. Among all selected genotypes, PHSS17 recorded lowest nymphal survival (38%), highest period of nymphal development (19.35) days and lowest growth index (1.96). On 60 day old plants, BPH had lower nymphal survival, longer development period, lower growth index and lower population buildup as compared to 40 day old plants. All selected rice genotypes showed strong antibiosis mechanism of resistance and the resistance appeared to be enhanced in 60 day old plants than in 40 day old plants.
Oryza sativa, Nilaparvata lugens, antibiosis, survival, population buildup
