author(s)
Vinod Kumar, Hem Singh, Sushil Kumar, MP Gautam and Sachin Kumar

abstract
The present investigation was conducted on “Construction on of stage specific life table of Rice Brown Plant Hopper (Nilaparvata lugens Stal.) on Pusa Basmati-1 and Pant Dhan-12 under natural condition” in White Grub Project Research Laboratory, Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut (U.P.) during Kharif, 2017. Life table studies, viz stage specific and survival of N. lugens Stal. on two different rice variety i.e. Pusa Basmati-1 and Pant Dhan-12 under natural condition indicate the insect preferred both the host species but Pusa Basmati-1 were favored and suitable food for the development of N. lugens Stal. stage specific life-table the apparent mortality at 5^thinstar nymph stage were shows that highest value 27.59 percent on Pant Dhan-12 where as compared on Pusa Basmati-1 recorded 23.81 percent. The lowest apparent mortality 6.17 percent was recorded at 2^nd instar nymph stage, on Pusa Basmati-1 whereas lowest 7.59 percent recorded on Pant Dhan-12. The highest survival fraction was recorded at 2^nd instar nymph stage 0.94 and 0.92 Pusa Basmati-1 and Pant Dhan-12, while minimum survival fraction was recorded at 5^th instar nymph stage 0.76 and 0.72 on Pusa Basmati-1 and Pant Dhan-12. The k-value is the key factor, which is primarily responsible for increase or decrease in number from one generation to another. The highest k-value 0.38 was observed on Pusa Basmati-1 and the lowest k-value 0.32 observed on Pant Dhan-12.