SCREENING OF SOME HYBRID RICE VARIETIES FOR RESISTANCE AGAINST MAJOR INSECT PESTS

Abstract

The experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka during the period from June to November 2009 to explore the resistance source(s) among different hybrid rice varieties against major insect pests. The study was conducted in randomized complete block design (RCBD) with three replications. Seven rice varieities were evaluated in the present study, among them six hybrid varieties viz. Hira-2, Taj-1, Aftaf-108, Krisan-2, Madhumati-2, Aloron and one check variety BR 11 popularly cultivated as HYV. The rice stem borer, rice hispa, rice bug, rice leaf roller, rice green leaf hopper, short horned grasshopper, long horned grasshopper were found as the major insect pests of rice and caused significant damages on all rice varieties. The check variety BR 11 performed best against all major insect pests among the varieties. The hybrid rice varity Hira-2 and Krisan-2 performed better against stem borer whereas susceptible found against rice hispa. Aloron found susceptible against stem borer followed by all other insect pests except short horned grass hopper. Considering yield and yield contributing characters, BR11 was superior to the others. The highest yield (4.376 ton/ha) was produced by BR11, where the lowest (1.946 ton/ha) was produced by Aftaf-108. Among hybrid varieties, the maximum yield (2.561 ton/ha) was produced by Aloron that was second highest of all varieties.