Vol. 8, Issue 6 (2019)

Author(s):
T Sharmitha, C Gailce Leo Justin, S Sheeba Joyce Roseleen and T Ramesh

Abstract:
A field trial was conducted at Anbil Dharmalingam Agricultural College and Research Institute, Tiruchirappalli District, Tamil Nadu, India for evaluating 48 rice accessions along with four varieties as check entries (TRY 1, TN 1, IWP, TRY 3) in their level of resistance to rice yellow stem borer, during Kharif 2018. Five accessions (AD 16124, AD 15101, AD 16189, AD 12182 and AD 12272) recorded nil dead heart and white ear head damage and were found to be highly resistant. Three accessions (AD 16157, AD 12132, AD 16157) were found to be highly susceptible. The number of trichomes ranged from 84.80/cm² leaf to 90.60/cm² leaf on upper surface and 16.40/cm² leaf to 20.00/cm² leaf on lower surface in the highly resistant accessions/varieties. The highly susceptible entries were found to have minimum number of trichomes ranging from 11.00/cm² leaf to 15.60/cm² leaf on upper surface and 1.60/cm² leaf to 2.80/cm² leaf on lower surface. Flag leaf angle of highly resistant accessions/varieties ranged from 1.33⁰ to 4.33⁰ (decreased leaf angle) and the flag leaf attitude is erect. The penultimate leaf angle of highly resistant accessions/varieties ranged from 6.33⁰ to 8.33⁰ (erect leaf attitude). Resistant and susceptible entries had semi-erect and horizontal leaf attitudes. Highly susceptible entries had greater leaf angle ranging from 76.00⁰ to 84.67⁰ (horizontal leaf attitude). The phenol content was maximum in the resistant entries ranging from 6.26 to 7.72 mg/g and minimum in the highly susceptible entries ranging from 2.53 to 3.21 mg/g. The susceptible entries had 4.40 to 5.00 egg masses/plant as against 1.00 to 1.60 egg masses /plant.