STRAINING INDICA RICE GENOTYPES FOR RESISTANCE AGAINST PREVELENCE OF LEAFFOLDER CNAPHALOCROCIS MEDINALIS GUENEE AND STEM BORERS SCRIPOPHAGA INCERTULAS WALKER

Leaffolder and stem borers have been reported the most detrimental insect pests of rice andcause substantial yield losses at multiple stages during lifecycle of rice crop. subsequently, a study was conducted to measure the levels of resistance present in different medium grain varieties and promising high yielding lines of rice, developed at rice research institute, kala shah kaku. of all the twenty three genotypes studied, mostly showed significant difference in their level of resistance against all the three studied insect pests. scatterplots against years 2012 and 2013 indicated high degree of stability of these genotypes for resistance against each insect during both the years. ksk-459 was found least susceptible against leaffolder during both the years, followed by line pk-8649, ir-77186 and ir-81852. ksk-459, ksk- 460, ksk-461, ksk-462, ksk 454 and lines ir 77186, ir 81852 were found resistant and showed least occurrence of dead heart due to stem borers. likewise, ksk-459, ksk-460 and ksk-462 and lines ir-77186, ir-81852 were found resistant and showed least occurrence of white head among all the studied genotypes. therefore, ksk-459, ir-77186 and ir-81852 may be utilized in different breeding programs as reliable and stable source for resistance against all the three insect pests for development of insect resistant varieties/ hybrids.