1Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, 141 004, India
2Department of Animal Nutrition, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141 004, India
Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, India
*E-mail: preetento@pau.edu
Online Published on 25 September, 2023.
Rice leaf folder, Cnaphalocrocis medinalis (Guenee) is a major insect pest in rice and can cause serious damage under favourable conditions. Host plant resistance is an economical, feasible and eco-friendly option for management of this pest. Fibre fractions viz. cellulose, hemicellulose and lignin were quantified in seven genotypes and their effect on larval and pupal parameters was studied. The total larval duration ranged from 15.1-19.6 days in these genotypes. Prolonged duration was in TKM6 and IET22155 (19.5 and 19.6 days, respectively), while percentage pupation (54.0% and 64.0%, respectively) was significantly less on these genotypes. Final instar larval weight was less in W1263, TKM6 and IET22155 (22.7-24.9 mg) than in other genotypes (>25.5 mg). Pupal weight varied from 17.1-22.9 mg and TKM6 and IET22155 recorded lesser pupal weight (17.1 and 18.8 mg, respectively). The cellulose and hemicellulose content was higher in TKM6, W1263 and IET22155, while lignin content was higher in TKM6, W1263 and JGL21066. Positive correlations were observed between larval duration and cellulose and hemicellulose. While negative correlations of larval weight with cellulose and hemicellulose was recorded. The per cent pupation was negatively correlated to lignin. Higher amount of the fibre fractions has negatively impacted the pupal weight.
Cnaphalocrocis medinalis, Rice leaffolder, Fibre fraction, Resistance, Cellulose, Hemicellulose, Lignin
