Abstract

Field trials on screening of rice accessions for resistance/susceptible to rice gall midge were carried out at Rice Research Station, Tirur, Thiruvallur district during samba, 2009. The rice cultures for all midge biotype monitoring trial (GMBT), gall midge screening (GMS) trial and multiple resistance screening trial (MRST) received from DRR, Hyderabad were raised in two rows of 20 hills per entry with a spacing of 15 x 15 cm in the main field. Gall midge incidence as silver shoot was recorded on 30 and 50 days after transplanting and scoring was done. Among the 17 entries screened in GMBT, the entries viz., ARC 6605 and INRC 3021 were recorded nil gall midge damage and found resistant to gall midge. The entries viz., INRC 202 and INRC 1997 were found to be moderately susceptible. The entries viz., Phalguna, Madhuri L 9, RP 2068-18-3-5, Abhaya and Aganni were found highly susceptible and the remaining seven entries were found susceptible to gall midge damage. The check variety TN 1 recorded the gall midge damage of 14.7% and found to be susceptible. Based on the reaction of the differentials (Resistant-Susceptible-Susceptible) the presence of biotype 3 was identified. Among 45 cultures screened in GMS, the cultures viz., RP 4683-29-2-645, RP 4683-30-1-648, RP 4686-49-1-943, RP 4687-52-2-1197, RP 4688-53-2-1258, RP 4688-53-2-1259, JGL 17025, JGL 17183, JGL 17187, JGL 17189, KAVYA, JGL 17190, JGL 17196, JGL 17198, JGL 17211 and JGL 17221 were recorded nil gall midge damage and found to be resistant in field screening. Check variety TN 1 was found to be highly susceptible.