Relative incidence of gall midge (Orseolia oryzae Wood-Mason) in some rice varieties in the agro-climatic conditions of Jharkhand Prasad Rabindra*, Hembrom Lakhindar, Kumar Binay, Prasad Devendra Departmen to Entomology, Faculty of Agriculture, Birsa Agricultural University, Kanke, Ranchi-834006(Jharkhand) *Email: rabindraento@yahoo.co.in
Online published on 30 November, 2019. Abstract The field experiment, conducted in the gall midge endemic district of Jharkhand during wet season in 2013 and 2014, to test 16 promising rice varieties for their relative resistance against gall midge (biotype-3), indicated that silver shoot (SS) ranged from 3.46 percent (Kavya) to 56.38 percent (MTU-7029). None of the test genotypes were free from gall midge incidence. Based on the pooled results of two year experimental results, the rice varieties receiving gall midge incidence in terms of silver shoot up to 5.00 percent were rated as highly resistant to gall midge. Accordingly four rice varieties viz, Kavya (2.91%SS), Lalat (3.91%SS), IR-36 (4.66%SS) and RD 202 (4.60%) emerged as highly resistant to gall midge. Suraksha (5.99%SS) and BG 380-2 (6.48%SS) remained moderately resistant to the pest. MTU-7029 (54.39%SS) and TN-1 (52.05%) received more than fifty percent incidence of silver shoot, caused by the pest, hence these two varieties were considered as highly susceptible to the pest. The maximum grains yield of 42.40 qha−1 was realized from Lalat, which remained at par with BG 380-2 (42.15 qha−1), Abhishek (41.65 qha−1), RD-202 (40.60 qha−1), and IR-36 (37.60 qha−1). Lowest yield of 25.65 qha−1 was obtained in case of the susceptible varieties TN-1, which remained at par with that of IR-64 (28.09 qha−1) and MTU-7029 (29.15 qha−1). As such, cultivation of Kavya, Lalat, IR-36 and RD-202 varieties of rice could be recommended in the gall midge endemic areas like, Simdega, Gumla, Khunti and Lohardagga districts of Jharkhand. Top Keywords Ricevarieties, gall midge, Orseolia oryzae, HPR, endemic areas, grainsyield. Top |